PHP必用代码片段

在编写代码的时候有个神奇的工具总是好的！下面这里收集了 50+ PHP 代码片段，可以帮助你开发 PHP 项目。

这些 PHP 片段对于 PHP 初学者也非常有帮助，非常容易学习，让我们开始学习吧～

1. 发送 SMS

在开发 Web 或者移动应用的时候，经常会遇到需要发送 SMS 给用户，或者因为登录原因，或者是为了发送信息。下面的 PHP 代码就实现了发送 SMS 的功能。
为了使用任何的语言发送 SMS，需要一个 SMS gateway。大部分的 SMS 会提供一个 API，这里是使用 MSG91 作为 SMS gateway。

function send_sms($mobile,$msg)
{
$authKey = "XXXXXXXXXXX";
date_default_timezone_set("Asia/Kolkata");
$date = strftime("%Y-%m-%d %H:%M:%S");
//Multiple mobiles numbers separated by comma
$mobileNumber = $mobile;

//Sender ID,While using route4 sender id should be 6 characters long.
$senderId = "IKOONK";

//Your message to send, Add URL encoding here.
$message = urlencode($msg);

//Define route
$route = "template";
//Prepare you post parameters
$postData = array(

'authkey' => $authKey,
'mobiles' => $mobileNumber,
'message' => $message,
'sender' => $senderId,
'route' => $route

);

//API URL
$url="https://control.msg91.com/sendhttp.php";

// init the resource
$ch = curl_init();
curl_setopt_array($ch, array(

CURLOPT_URL => $url,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_POST => true,
CURLOPT_POSTFIELDS => $postData
//,CURLOPT_FOLLOWLOCATION => true

));

//Ignore SSL certificate verification
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);

//get response
$output = curl_exec($ch);
//Print error if any
if(curl_errno($ch))
{

echo 'error:' . curl_error($ch);

}

curl_close($ch);
}
其中“$authKey = "XXXXXXXXXXX";”需要你输入你的密码，“$senderId = "IKOONK";”需要你输入你的 SenderID。当输入移动号码的时候需要指定国家代码 (比如，美国是 1，印度是 91 )。
语法：

<?php
$message = "Hello World";
$mobile = "918112998787";
send_sms($mobile,$message);
?>

2. 使用 mandrill 发送邮件
   Mandrill 是一款强大的 SMTP 提供器。开发者倾向于使用一个第三方 SMTP provider 来获取更好的收件交付。
   下面的函数中，你需要把 “Mandrill.php” 放在同一个文件夹，作为 PHP 文件，这样就可以使用TA来发送邮件。

function send_email($to_email,$subject,$message1)
{
require_once 'Mandrill.php';
$apikey = 'XXXXXXXXXX'; //specify your api key here
$mandrill = new Mandrill($apikey);

$message = new stdClass();
$message->html = $message1;
$message->text = $message1;
$message->subject = $subject;
$message->from_email = "blog@koonk.com";//Sender Email
$message->from_name = "KOONK";//Sender Name
$message->to = array(array("email" => $to_email));
$message->track_opens = true;

$response = $mandrill->messages->send($message);
}
$apikey = 'XXXXXXXXXX'; //specify your api key here”这里需要你指定你的 API 密钥（从 Mandrill 账户中获得）。
语法：

<?php
$to = "abc@example.com";
$subject = "This is a test email";
$message = "Hello World!";
send_email($to,$subject,$message);
?>
为了达到最好的效果，最好按照 Mandrill 的教程去配置 DNS。

3. PHP 函数：阻止 SQL 注入
   SQL 注入或者 SQLi 常见的攻击网站的手段，使用下面的代码可以帮助你防止这些工具。

function clean($input)
{

if (is_array($input))
{
    foreach ($input as $key => $val)
     {
        $output[$key] = clean($val);
        // $output[$key] = $this->clean($val);
    }
}
else
{
    $output = (string) $input;
    // if magic quotes is on then use strip slashes
    if (get_magic_quotes_gpc()) 
    {
        $output = stripslashes($output);
    }
    // $output = strip_tags($output);
    $output = htmlentities($output, ENT_QUOTES, 'UTF-8');
}

// return the clean text

return $output;

}
语法：

<?php
$text = "";
$text = clean($text);
echo $text;
?>

4. 检测用户位置
   使用下面的函数，可以检测用户是在哪个城市访问你的网站

function detect_city($ip) {

               
    $default = 'UNKNOWN';
        
    $curlopt_useragent = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)';
               
    $url = 'http://ipinfodb.com/ip_locator.php?ip=' . urlencode($ip);
    $ch = curl_init();
               
    $curl_opt = array(
        CURLOPT_FOLLOWLOCATION  => 1,
        CURLOPT_HEADER      => 0,
        CURLOPT_RETURNTRANSFER  => 1,
        CURLOPT_USERAGENT   => $curlopt_useragent,
        CURLOPT_URL       => $url,
        CURLOPT_TIMEOUT         => 1,
        CURLOPT_REFERER         => 'http://' . $_SERVER['HTTP_HOST'],
    );
               
    curl_setopt_array($ch, $curl_opt);
               
    $content = curl_exec($ch);
               
    if (!is_null($curl_info)) {
        $curl_info = curl_getinfo($ch);
    }
               
    curl_close($ch);
               
    if ( preg_match('{<li>City : ([^<]*)</li>}i', $content, $regs) )  {
        $city = $regs[1];
    }
    if ( preg_match('{<li>State/Province : ([^<]*)</li>}i', $content, $regs) )  {
        $state = $regs[1];
    }
        
    if( $city!='' && $state!='' ){
      $location = $city . ', ' . $state;
      return $location;
    }else{
      return $default; 
    }
               
}

语法：

<?php
$ip = $_SERVER['REMOTE_ADDR'];
$city = detect_city($ip);
echo $city;
?>

5. 获取 Web 页面的源代码
   使用下面的函数，可以获取任意 Web 页面的 HTML 代码

function display_sourcecode($url)
{
$lines = file($url);
$output = "";
foreach ($lines as $line_num => $line) {

// loop thru each line and prepend line numbers
$output.= "Line #<b>{$line_num}</b> : " . htmlspecialchars($line) . "\n";

}
}
语法：

<?php
$url = "http://blog.koonk.com";
$source = display_sourcecode($url);
echo $source;
?>

6. 计算喜欢你的 Facebook 页面的用户

function fb_fan_count($facebook_name)
{

$data = json_decode(file_get_contents("https://graph.facebook.com/".$facebook_name));
$likes = $data->likes;
return $likes;

}
语法：

<?php
$page = "koonktechnologies";
$count = fb_fan_count($page);
echo $count;
?>

7. 确定任意图片的主导颜色

function dominant_color($image)
{
$i = imagecreatefromjpeg($image);
for ($x=0;$x<imagesx($i);$x++) {

for ($y=0;$y<imagesy($i);$y++) {
    $rgb = imagecolorat($i,$x,$y);
    $r   = ($rgb >> 16) & 0xFF;
    $g   = ($rgb >>  & 0xFF;
    $b   = $rgb & 0xFF;
    $rTotal += $r;
    $gTotal += $g;
    $bTotal += $b;
    $total++;
}

}
$rAverage = round($rTotal/$total);
$gAverage = round($gTotal/$total);
$bAverage = round($bTotal/$total);
}

8. whois 查询
   使用下面的函数可以获取任何域名用户的完整细节

function whois_query($domain) {

     
// fix the domain name:
$domain = strtolower(trim($domain));
$domain = preg_replace('/^http:\/\//i', '', $domain);
$domain = preg_replace('/^www\./i', '', $domain);
$domain = explode('/', $domain);
$domain = trim($domain[0]);
     
// split the TLD from domain name
$_domain = explode('.', $domain);
$lst = count($_domain)-1;
$ext = $_domain[$lst];
     
// You find resources and lists 
// like these on wikipedia: 
//
// http://de.wikipedia.org/wiki/Whois
//
$servers = array(
    "biz" => "whois.neulevel.biz",
    "com" => "whois.internic.net",
    "us" => "whois.nic.us",
    "coop" => "whois.nic.coop",
    "info" => "whois.nic.info",
    "name" => "whois.nic.name",
    "net" => "whois.internic.net",
    "gov" => "whois.nic.gov",
    "edu" => "whois.internic.net",
    "mil" => "rs.internic.net",
    "int" => "whois.iana.org",
    "ac" => "whois.nic.ac",
    "ae" => "whois.uaenic.ae",
    "at" => "whois.ripe.net",
    "au" => "whois.aunic.net",
    "be" => "whois.dns.be",
    "bg" => "whois.ripe.net",
    "br" => "whois.registro.br",
    "bz" => "whois.belizenic.bz",
    "ca" => "whois.cira.ca",
    "cc" => "whois.nic.cc",
    "ch" => "whois.nic.ch",
    "cl" => "whois.nic.cl",
    "cn" => "whois.cnnic.net.cn",
    "cz" => "whois.nic.cz",
    "de" => "whois.nic.de",
    "fr" => "whois.nic.fr",
    "hu" => "whois.nic.hu",
    "ie" => "whois.domainregistry.ie",
    "il" => "whois.isoc.org.il",
    "in" => "whois.ncst.ernet.in",
    "ir" => "whois.nic.ir",
    "mc" => "whois.ripe.net",
    "to" => "whois.tonic.to",
    "tv" => "whois.tv",
    "ru" => "whois.ripn.net",
    "org" => "whois.pir.org",
    "aero" => "whois.information.aero",
    "nl" => "whois.domain-registry.nl"
);
     
if (!isset($servers[$ext])){
    die('Error: No matching nic server found!');
}
     
$nic_server = $servers[$ext];
     
$output = '';
     
// connect to whois server:
if ($conn = fsockopen ($nic_server, 43)) {
    fputs($conn, $domain."\r\n");
    while(!feof($conn)) {
        $output .= fgets($conn,128);
    }
    fclose($conn);
}
else { die('Error: Could not connect to ' . $nic_server . '!'); }
     
return $output;

}

语法：

<?php
$domain = "http://www.blog.koonk.com";
$result = whois_query($domain);
print_r($result);
?>

9. 验证邮箱地址
   有时候，当在网站填写表单，用户可能会输入错误的邮箱地址，这个函数可以验证邮箱地址是否有效。

function is_validemail($email)
{
$check = 0;
if(filter_var($email,FILTER_VALIDATE_EMAIL))
{
$check = 1;
}
return $check;
}

语法：
<?php
$email = "blog@koonk.com";
$check = is_validemail($email);
echo $check;
// If the output is 1, then email is valid.
?>

10. 获取用户的真实 IP

function getRealIpAddr()
{

if (!emptyempty($_SERVER['HTTP_CLIENT_IP']))  
{  
    $ip=$_SERVER['HTTP_CLIENT_IP'];  
}  
elseif (!emptyempty($_SERVER['HTTP_X_FORWARDED_FOR']))  
//to check ip is pass from proxy  
{  
    $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];  
}  
else  
{  
    $ip=$_SERVER['REMOTE_ADDR'];  
}  
return $ip;  

}
语法：

<?php
$ip = getRealIpAddr();
echo $ip;
?>

11. 转换 URL：从字符串变成超链接
    如果你正在开发论坛，博客或者是一个常规的表单提交，很多时候都要用户访问一个网站。使用这个函数，URL 字符串就可以自动的转换为超链接。

function makeClickableLinks($text)
{
$text = eregi_replace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_+.~#?&//=]+)',
'\1', $text);
$text = eregi_replace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_+.~#?&//=]+)',
'\1\2', $text);
$text = eregi_replace('([_.0-9a-z-]+@(0-9a-z+.)+[a-z]{2,3})',
'\1', $text);

return $text;
}

语法：
<?php
$text = "This is my first post on http://blog.koonk.com";
$text = makeClickableLinks($text);
echo $text;
?>

12. 阻止多个 IP 访问你的网站
    这个代码片段可以方便你禁止某些特定的 IP 地址访问你的网站

if ( !file_exists('blocked_ips.txt') ) {
$deny_ips = array(
'127.0.0.1',
'192.168.1.1',
'83.76.27.9',
'192.168.1.163'
);
} else {
$deny_ips = file('blocked_ips.txt');
}
// read user ip adress:
$ip = isset($_SERVER['REMOTE_ADDR']) ? trim($_SERVER['REMOTE_ADDR']) : '';

// search current IP in $deny_ips array
if ( (array_search($ip, $deny_ips))!== FALSE ) {
// address is blocked:
echo 'Your IP adress ('.$ip.') was blocked!';
exit;
}

13. 强制性文件下载
    如果你需要下载特定的文件而不用另开新窗口，下面的代码片段可以帮助你。

function force_download($file)
{

$dir      = "../log/exports/"; 
if ((isset($file))&&(file_exists($dir.$file))) { 
   header("Content-type: application/force-download"); 
   header('Content-Disposition: inline; filename="' . $dir.$file . '"'); 
   header("Content-Transfer-Encoding: Binary"); 
   header("Content-length: ".filesize($dir.$file)); 
   header('Content-Type: application/octet-stream'); 
   header('Content-Disposition: attachment; filename="' . $file . '"'); 
   readfile("$dir$file"); 
} else { 
   echo "No file selected"; 
} 

}

语法：

<php
force_download("image.jpg");
?>

14. 创建 JSON 数据
    使用下面的 PHP 片段可以创建 JSON 数据，可以方便你创建移动应用的 Web 服务

$json_data = array ('id'=>1,'name'=>"Mohit");
echo json_encode($json_data);

15. 压缩 zip 文件
    使用下面的 PHP 片段可以即时压缩 zip 文件

function create_zip($files = array(),$destination = '',$overwrite = false) {

//if the zip file already exists and overwrite is false, return false  
if(file_exists($destination) && !$overwrite) { return false; }  
//vars  
$valid_files = array();  
//if files were passed in...  
if(is_array($files)) {  
    //cycle through each file  
    foreach($files as $file) {  
        //make sure the file exists  
        if(file_exists($file)) {  
            $valid_files[] = $file;  
        }  
    }  
}  
//if we have good files...  
if(count($valid_files)) {  
    //create the archive  
    $zip = new ZipArchive();  
    if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) {  
        return false;  
    }  
    //add the files  
    foreach($valid_files as $file) {  
        $zip->addFile($file,$file);  
    }  
    //debug  
    //echo 'The zip archive contains ',$zip->numFiles,' files with a status of ',$zip->status;  
             
    //close the zip -- done!  
    $zip->close();  
             
    //check to make sure the file exists  
    return file_exists($destination);  
}  
else  
{  
    return false;  
}  

}

语法：
<?php
$files=array('file1.jpg', 'file2.jpg', 'file3.gif');
create_zip($files, 'myzipfile.zip', true);
?>

16. 解压文件

function unzip($location,$newLocation)
{

    if(exec("unzip $location",$arr)){
        mkdir($newLocation);
        for($i = 1;$i< count($arr);$i++){
            $file = trim(preg_replace("~inflating: ~","",$arr[$i]));
            copy($location.'/'.$file,$newLocation.'/'.$file);
            unlink($location.'/'.$file);
        }
        return TRUE;
    }else{
        return FALSE;
    }

}

语法：

<?php
unzip('test.zip','unziped/test'); //File would be unzipped in unziped/test folder
?>

17. 缩放图片

function resize_image($filename, $tmpname, $xmax, $ymax)
{

$ext = explode(".", $filename);  
$ext = $ext[count($ext)-1];  
     
if($ext == "jpg" || $ext == "jpeg")  
    $im = imagecreatefromjpeg($tmpname);  
elseif($ext == "png")  
    $im = imagecreatefrompng($tmpname);  
elseif($ext == "gif")  
    $im = imagecreatefromgif($tmpname);  
         
$x = imagesx($im);  
$y = imagesy($im);  
         
if($x <= $xmax && $y <= $ymax)  
    return $im;  
     
if($x >= $y) {  
    $newx = $xmax;  
    $newy = $newx * $y / $x;  
}  
else {  
    $newy = $ymax;  
    $newx = $x / $y * $newy;  
}  
         
$im2 = imagecreatetruecolor($newx, $newy);  
imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y);  
return $im2;   

}

18. 使用 mail() 发送邮件
    之前我们提供了如何使用 Mandrill 发送邮件的 PHP 代码片段，但是如果你不想使用第三方服务，那么可以使用下面的 PHP 代码片段。

function send_mail($to,$subject,$body)
{
$headers = "From: KOONK\r\n";
$headers .= "Reply-To: blog@koonk.com\r\n";
$headers .= "Return-Path: blog@koonk.com\r\n";
$headers .= "X-Mailer: PHP5\n";
$headers .= 'MIME-Version: 1.0' . "\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
mail($to,$subject,$body,$headers);
}

语法：
<?php
$to = "admin@koonk.com";
$subject = "This is a test mail";
$body = "Hello World!";
send_mail($to,$subject,$body);
?>

19. 把秒转换成天数，小时数和分钟

function secsToStr($secs) {

if($secs>=86400){$days=floor($secs/86400);$secs=$secs%86400;$r=$days.' day';if($days<>1){$r.='s';}if($secs>0){$r.=', ';}}
if($secs>=3600){$hours=floor($secs/3600);$secs=$secs%3600;$r.=$hours.' hour';if($hours<>1){$r.='s';}if($secs>0){$r.=', ';}}
if($secs>=60){$minutes=floor($secs/60);$secs=$secs%60;$r.=$minutes.' minute';if($minutes<>1){$r.='s';}if($secs>0){$r.=', ';}}
$r.=$secs.' second';if($secs<>1){$r.='s';}
return $r;

}
语法：

<?php
$seconds = "56789";
$output = secsToStr($seconds);
echo $output;
?>

20. 数据库连接
    连接 MySQL 数据库

<?php
$DBNAME = 'koonk';
$HOST = 'localhost';
$DBUSER = 'root';
$DBPASS = 'koonk';
$CONNECT = mysql_connect($HOST,$DBUSER,$DBPASS);
if(!$CONNECT)
{

echo 'MySQL Error: '.mysql_error();

}
$SELECT = mysql_select_db($DBNAME);
if(!$SELECT)
{

echo 'MySQL Error: '.mysql_error();

}
?>

21. 目录清单
    使用下面的 PHP 代码片段可以在一个目录中列出所有文件和文件夹

function list_files($dir)
{

if(is_dir($dir))
{
    if($handle = opendir($dir))
    {
        while(($file = readdir($handle)) !== false)
        {
            if($file != "." && $file != ".." && $file != "Thumbs.db"/*pesky windows, images..*/)
            {
                echo '<a target="_blank" href="'.$dir.$file.'">'.$file.'</a>'."\n";
            }
        }
        closedir($handle);
    }
}

}

语法：

<?php

list_files("images/"); //This will list all files of images folder

?>

22. 检测用户语言
    使用下面的 PHP 代码片段可以检测用户浏览器所使用的语言

function get_client_language($availableLanguages, $default='en'){

if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
    $langs=explode(',',$_SERVER['HTTP_ACCEPT_LANGUAGE']);
    foreach ($langs as $value){
        $choice=substr($value,0,2);
        if(in_array($choice, $availableLanguages)){
            return $choice;
        }
    }
} 
return $default;

}

23. 查看 CSV 文件

function readCSV($csvFile){

$file_handle = fopen($csvFile, 'r');
while (!feof($file_handle) ) {
    $line_of_text[] = fgetcsv($file_handle, 1024);
}
fclose($file_handle);
return $line_of_text;

}

语法：
<?php
$csvFile = "test.csv";
$csv = readCSV($csvFile);
$a = csv0; // This will get value of Column 1 & Row 1
?>

24. 从 PHP 数据创建 CSV 文件

function generateCsv($data, $delimiter = ',', $enclosure = '"') {
$handle = fopen('php://temp', 'r+');
foreach ($data as $line) {

       fputcsv($handle, $line, $delimiter, $enclosure);

}
rewind($handle);
while (!feof($handle)) {

       $contents .= fread($handle, 8192);

}
fclose($handle);
return $contents;
}

语法：
<?php
$data[0] = "apple";
$data[1] = "oranges";
generateCsv($data, $delimiter = ',', $enclosure = '"');
?>

25. 解析 XML 数据

$xml_string="<?xml version='1.0'?>

<molecule name='Benzine'>
    <symbol>ben</symbol>
    <code>A</code>
</molecule>
<molecule name='Water'>
    <symbol>h2o</symbol>
    <code>K</code>
</molecule>

";

//load the xml string using simplexml function
$xml = simplexml_load_string($xml_string);

//loop through the each node of molecule
foreach ($xml->molecule as $record)
{
//attribute are accessted by
echo $record['name'], ' ';
//node are accessted by -> operator
echo $record->symbol, ' ';
echo $record->code, '';
}

26. 解析 JSON 数据

$json_string='{"id":1,"name":"rolf","country":"russia","office":["google","oracle"]} ';
$obj=json_decode($json_string);
//print the parsed data
echo $obj->name; //displays rolf
echo $obj->office[0]; //displays google

27. 获取当前页面 URL
    这个 PHP 片段可以帮助你让用户登录后直接跳转到之前浏览的页面

function current_url()
{
$url = "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
$validURL = str_replace("&", "&", $url);
return validURL;
}

语法：

<?php
echo "Currently you are on: ".current_url();
?>

28. 从任意的 Twitter 账号获取最新的 Tweet

function my_twitter($username)
{

 $no_of_tweets = 1;
 $feed = "http://search.twitter.com/search.atom?q=from:" . $username . "&rpp=" . $no_of_tweets;
 $xml = simplexml_load_file($feed);
foreach($xml->children() as $child) {
    foreach ($child as $value) {
        if($value->getName() == "link") $link = $value['href'];
        if($value->getName() == "content") {
            $content = $value . "";
    echo '<p class="twit">'.$content.' <a class="twt" href="'.$link.'" title="">  </a></p>';
        }    
    }
}    

}

语法：
<?php
$handle = "koonktech";
my_twitter($handle);
?>

29. 转发数量
    使用这个 PHP 片段可以检测你的页面 URL 有多少转发数量

function tweetCount($url) {

$content = file_get_contents("http://api.tweetmeme.com/url_info?url=".$url);
$element = new SimpleXmlElement($content);
$retweets = $element->story->url_count;
if($retweets){
    return $retweets;
} else {
    return 0;
}

}

语法：
<?php
$url = "http://blog.koonk.com";
$count = tweetCount($url);
return $count;
?>

30. 计算两个日期的差

<?php
$date1 = date( 'Y-m-d' );
$date2 = "2015-12-04";
$diff = abs(strtotime($date2) - strtotime($date1));
$years = floor($diff / (3656060*24));
$months = floor(($diff - $years 365606024) / (306060*24));
$days = floor(($diff - $years * 365*60*60*24 - $months30606024)/ (606024));
printf("%d years, %d months, %d days\n", $years, $months, $days);
-------------------------------------------------------- OR
$date1 = new DateTime("2007-03-24");
$date2 = new DateTime("2009-06-26");
$interval = $date1->diff($date2);
echo "difference " . $interval->y . " years, " . $interval->m." months, ".$interval->d." days ";
// shows the total amount of days (not divided into years, months and days like above)
echo "difference " . $interval->days . " days ";
-------------------------------------------------------- OR

/**

• Calculate differences between two dates with precise semantics. Based on PHPs DateTime::diff()
• implementation by Derick Rethans. Ported to PHP by Emil H, 2011-05-02. No rights reserved.
• See here for original code:
• http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/tm2unixtime.c?revision=302890&view=markup
• http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/interval.c?revision=298973&view=markup
  */

function _date_range_limit($start, $end, $adj, $a, $b, $result)
{

if ($result[$a] < $start) {
    $result[$b] -= intval(($start - $result[$a] - 1) / $adj) + 1;
    $result[$a] += $adj * intval(($start - $result[$a] - 1) / $adj + 1);
}
if ($result[$a] >= $end) {
    $result[$b] += intval($result[$a] / $adj);
    $result[$a] -= $adj * intval($result[$a] / $adj);
}
return $result;

}
function _date_range_limit_days($base, $result)
{

$days_in_month_leap = array(31, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
$days_in_month = array(31, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
_date_range_limit(1, 13, 12, "m", "y", &$base);
$year = $base["y"];
$month = $base["m"];
if (!$result["invert"]) {
    while ($result["d"] < 0) {
        $month--;
        if ($month < 1) {
            $month += 12;
            $year--;
        }
        $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0);
        $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month];
        $result["d"] += $days;
        $result["m"]--;
    }
} else {
    while ($result["d"] < 0) {
        $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0);
        $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month];
        $result["d"] += $days;
        $result["m"]--;
        $month++;
        if ($month > 12) {
            $month -= 12;
            $year++;
        }
    }
}
return $result;

}
function _date_normalize($base, $result)
{

$result = _date_range_limit(0, 60, 60, "s", "i", $result);
$result = _date_range_limit(0, 60, 60, "i", "h", $result);
$result = _date_range_limit(0, 24, 24, "h", "d", $result);
$result = _date_range_limit(0, 12, 12, "m", "y", $result);
$result = _date_range_limit_days(&$base, &$result);
$result = _date_range_limit(0, 12, 12, "m", "y", $result);
return $result;

}
/**

• Accepts two unix timestamps.
  */

function _date_diff($one, $two)
{

$invert = false;
if ($one > $two) {
    list($one, $two) = array($two, $one);
    $invert = true;
}
$key = array("y", "m", "d", "h", "i", "s");
$a = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $one))));
$b = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $two))));
$result = array();
$result["y"] = $b["y"] - $a["y"];
$result["m"] = $b["m"] - $a["m"];
$result["d"] = $b["d"] - $a["d"];
$result["h"] = $b["h"] - $a["h"];
$result["i"] = $b["i"] - $a["i"];
$result["s"] = $b["s"] - $a["s"];
$result["invert"] = $invert ? 1 : 0;
$result["days"] = intval(abs(($one - $two)/86400));
if ($invert) {
    _date_normalize(&$a, &$result);
} else {
    _date_normalize(&$b, &$result);
}
return $result;

}
$date = "2014-12-04 19:37:22";
echo '

';
print_r( _date_diff( strtotime($date), time() ) );
echo '

31. 删除文件夹内容

function Delete($path)
{

if (is_dir($path) === true)
{
    $files = array_diff(scandir($path), array('.', '..'));
    foreach ($files as $file)
    {
        Delete(realpath($path) . '/' . $file);
    }
    return rmdir($path);
}
else if (is_file($path) === true)
{
    return unlink($path);
}
return false;

}

语法：

<?php
$path = "images/";
Delete($path); // This will delete images folder along with its contents.
?>

32. 搜索和高亮字符串中的关键字

function highlighter_text($text, $words)
{

$split_words = explode( " " , $words );
foreach($split_words as $word)
{
    $color = "#4285F4";
    $text = preg_replace("|($word)|Ui" ,
        "<span style=\"color:".$color.";\"><b>$1</b></span>" , $text );
}
return $text;

}
语法：

<?php
$string = "I like chocolates and I like apples";
$words = "apple";
echo highlighter_text($string ,$words);
?>

33. 写入文件

<?
$filename = 'blog.csv';
$fp = fopen($filename, 'w');
$output = " Hello ";
$output .= " World! ";
$output .= "\r\n";
fputs($fp, $output);
fclose($fp);
?>

34. 根据 URL 下载图片

function imagefromURL($image,$rename)
{
$ch = curl_init($image);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_BINARYTRANSFER,1);
$rawdata=curl_exec ($ch);
curl_close ($ch);
$fp = fopen("$rename",'w');
fwrite($fp, $rawdata);
fclose($fp);
}

语法：

<?php
$url = "http://koonk.com/images/logo.png";
$rename = "koonk.png";
imagefromURL($url,$rename);
?>

35. 检测 URL 是否有效

function isvalidURL($url)
{
$check = 0;
if (filter_var($url, FILTER_VALIDATE_URL) !== false) {
$check = 1;
}
return $check;
}

语法：
<?php
$url = "http://koonk.com";
$check = checkvalidURL($url);
echo $check; //if returns 1 then URL is valid.
?>

36. 生成二维码

function qr_code($data, $type = "TXT", $size ='150', $ec='L', $margin='0')
{

 $types = array("URL" =--> "http://", "TEL" => "TEL:", "TXT"=>"", "EMAIL" => "MAILTO:");
if(!in_array($type,array("URL", "TEL", "TXT", "EMAIL")))
{
    $type = "TXT";
}
if (!preg_match('/^'.$types[$type].'/', $data))
{
    $data = str_replace("\\", "", $types[$type]).$data;
}
$ch = curl_init();
$data = urlencode($data);
curl_setopt($ch, CURLOPT_URL, 'http://chart.apis.google.com/chart');
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, 'chs='.$size.'x'.$size.'&cht=qr&chld='.$ec.'|'.$margin.'&chl='.$data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
$response = curl_exec($ch);
curl_close($ch);
return $response;

}

语法：

<?php
header("Content-type: image/png");
echo qr_code("http://koonk.com", "URL");
?>

37. 计算两个地图坐标之间的距离

function getDistanceBetweenPointsNew($latitude1, $longitude1, $latitude2, $longitude2) {

$theta = $longitude1 - $longitude2;
$miles = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + (cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta)));
$miles = acos($miles);
$miles = rad2deg($miles);
$miles = $miles * 60 * 1.1515;
$feet = $miles * 5280;
$yards = $feet / 3;
$kilometers = $miles * 1.609344;
$meters = $kilometers * 1000;
return compact('miles','feet','yards','kilometers','meters'); 

}

语法：

<?php
$point1 = array('lat' => 40.770623, 'long' => -73.964367);
$point2 = array('lat' => 40.758224, 'long' => -73.917404);
$distance = getDistanceBetweenPointsNew($point1['lat'], $point1['long'], $point2['lat'], $point2['long']);
foreach ($distance as $unit => $value) {

echo $unit.': '.number_format($value,4).'';

}
?>

38. 获取一个特定话题标签的所有 Tweets

function getTweets($hash_tag) {

$url = 'http://search.twitter.com/search.atom?q='.urlencode($hash_tag) ;
echo "<p>Connecting to <strong>$url</strong> ...</p>";
$ch = curl_init($url);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, TRUE);
$xml = curl_exec ($ch);
curl_close ($ch);
//If you want to see the response from Twitter, uncomment this next part out:
//echo "<p>Response:</p>";
//echo "<pre>".htmlspecialchars($xml)."</pre>";
$affected = 0;
$twelement = new SimpleXMLElement($xml);
foreach ($twelement->entry as $entry) {
    $text = trim($entry->title);
    $author = trim($entry->author->name);
    $time = strtotime($entry->published);
    $id = $entry->id;
    echo "<p>Tweet from ".$author.": <strong>".$text."</strong>  <em>Posted ".date('n/j/y g:i a',$time)."</em></p>";
}
return true ;

}

39. 添加 th,st,nd 或者 rd 作为数字的后缀

Friday the 13th
function ordinal($cdnl){

$test_c = abs($cdnl) % 10; 
$ext = ((abs($cdnl) %100 < 21 && abs($cdnl) %100 > 4) ? 'th'
        : (($test_c < 4) ? ($test_c < 3) ? ($test_c < 2) ? ($test_c < 1) 
        ? 'th' : 'st' : 'nd' : 'rd' : 'th')); 
return $cdnl.$ext; 

}
语法：

<?php
$number = 10;
echo ordinal($number); //output is 10th
?>

40. 限制文件下载的速度

<?php
// local file that should be send to the client
$local_file = 'test-file.zip';
// filename that the user gets as default
$download_file = 'your-download-name.zip';

// set the download rate limit (=> 20,5 kb/s)
$download_rate = 20.5;
if(file_exists($local_file) && is_file($local_file)) {

// send headers
header('Cache-control: private');
header('Content-Type: application/octet-stream'); 
header('Content-Length: '.filesize($local_file));
header('Content-Disposition: filename='.$download_file);

// flush content
flush();    
// open file stream
$file = fopen($local_file, "r");    
while(!feof($file)) {

    // send the current file part to the browser
    print fread($file, round($download_rate * 1024));    

    // flush the content to the browser
    flush();

    // sleep one second
    sleep(1);    
}    

// close file stream
fclose($file);}

else {

die('Error: The file '.$local_file.' does not exist!');

}
?>

41. 把文本转换成图片

<?php
header("Content-type: image/png");
$string = $_GET['text'];
$im = imagecreatefrompng("images/button.png");
$color = imagecolorallocate($im, 255, 255, 255);
$px = (imagesx($im) - 7.5 * strlen($string)) / 2;
$py = 9;
$fontSize = 1;
imagestring($im, fontSize, $px, $py, $string, $color);
imagepng($im);
imagedestroy($im);
?>

42. 获取远程文件的大小

function remote_filesize($url, $user = "", $pw = "")
{

ob_start();
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_NOBODY, 1);
if(!empty($user) && !empty($pw))
{
    $headers = array('Authorization: Basic ' .  base64_encode("$user:$pw"));
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
}
$ok = curl_exec($ch);
curl_close($ch);
$head = ob_get_contents();
ob_end_clean();
$regex = '/Content-Length:\s([0-9].+?)\s/';
$count = preg_match($regex, $head, $matches);
return isset($matches[1]) ? $matches[1] : "unknown";

}

语法：

<?php
$file = "http://koonk.com/images/logo.png";
$size = remote_filesize($url);
echo $size;
?>

43. 使用 imagebrick 进行 pdf 到图像的转换

10
<?php
$pdf_file = './pdf/demo.pdf';
$save_to = './jpg/demo.jpg'; //make sure that apache has permissions to write in this folder! (common problem)
//execute ImageMagick command 'convert' and convert PDF to JPG with applied settings
exec('convert "'.$pdf_file.'" -colorspace RGB -resize 800 "'.$save_to.'"', $output, $return_var);
if($return_var == 0) { //if exec successfuly converted pdf to jpg

print "Conversion OK";

}
else print "Conversion failed.".$output;
?>

44. 使用 tinyurl 生成短网址

function get_tiny_url($url)
{

$ch = curl_init();  
$timeout = 5;  
curl_setopt($ch,CURLOPT_URL,'http://tinyurl.com/api-create.php?url='.$url);  
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);  
curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);  
$data = curl_exec($ch);  
curl_close($ch);  
return $data;  

}

语法：

<?php
$url = "http://blog.koonk.com/2015/07/Hello-World";
$tinyurl = get_tiny_url($url);
echo $tinyurl;
?>

45. youtube 下载链接生成器
    使用下面的 PHP 片段可以让你的用户下载 Youtube 视频

function str_between($string, $start, $end)
{
$string = " ".$string; $ini = strpos($string,$start); if ($ini == 0) return ""; $ini += strlen($start); $len = strpos($string,$end,$ini) - $ini; return substr($string,$ini,$len); }
function get_youtube_download_link(){

$youtube_link = $_GET['youtube'];
$youtube_page = file_get_contents($youtube_link);
$v_id = str_between($youtube_page, "&video_id=", "&");
$t_id = str_between($youtube_page, "&t=", "&");
$flv_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id";
$hq_flv_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=6";
$mp4_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=18";
$threegp_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=17";
echo "\t\tDownload (right-click > save as):\n\t\t";
echo "<a href=\"$flv_link\">FLV</a>\n\t\t";
echo "<a href=\"$hq_flv_link\">HQ FLV (if available)</a>\n\t\t";
echo "<a href=\"$mp4_link\">MP4</a>\n\t\t";
echo "<a href=\"$threegp_link\">3GP</a>\n";

}

46. Facebook 样式的时间戳

Facebook (x mins age, y hours ago etc)
function nicetime($date)
{

if(empty($date)) {
    return "No date provided";
}
   
$periods         = array("second", "minute", "hour", "day", "week", "month", "year", "decade");
$lengths         = array("60","60","24","7","4.35","12","10");
   
$now             = time();
$unix_date         = strtotime($date);
   
   // check validity of date
if(empty($unix_date)) {    
    return "Bad date";
}
// is it future date or past date
if($now > $unix_date) {    
    $difference     = $now - $unix_date;
    $tense         = "ago";
       
} else {
    $difference     = $unix_date - $now;
    $tense         = "from now";
}
   
for($j = 0; $difference >= $lengths[$j] && $j < count($lengths)-1; $j++) {
    $difference /= $lengths[$j];
}
   
$difference = round($difference);
   
if($difference != 1) {
    $periods[$j].= "s";
}
   
return "$difference $periods[$j] {$tense}";

}
语法：

<?php
$date = "2015-07-05 03:45";
$result = nicetime($date); // 2 days ago
?>

47、黑名单过滤

function is_spam($text, $file, $split = ':', $regex = false){

$handle = fopen($file, 'rb'); 
$contents = fread($handle, filesize($file)); 
fclose($handle); 
$lines = explode("n", $contents); 
$arr = array(); 
foreach($lines as $line){ 
    list($word, $count) = explode($split, $line); 
    if($regex) 
        $arr[$word] = $count; 
    else
        $arr[preg_quote($word)] = $count; 
} 
preg_match_all("~".implode('|', array_keys($arr))."~", $text, $matches); 
$temp = array(); 
foreach($matches[0] as $match){ 
    if(!in_array($match, $temp)){ 
        $temp[$match] = $temp[$match] + 1; 
        if($temp[$match] >= $arr[$word]) 
            return true; 
    } 
} 
return false; 

}

$file = 'spam.txt';
$str = 'This string has cat, dog word';
if(is_spam($str, $file))

echo 'this is spam'; 

else

echo 'this is not spam';

输出：

ab:3
dog:3
cat:2
monkey:2
48、随机颜色生成器

function randomColor() {

$str = '#'; 
for($i = 0 ; $i < 6 ; $i++) { 
    $randNum = rand(0 , 15); 
    switch ($randNum) { 
        case 10: $randNum = 'A'; break; 
        case 11: $randNum = 'B'; break; 
        case 12: $randNum = 'C'; break; 
        case 13: $randNum = 'D'; break; 
        case 14: $randNum = 'E'; break; 
        case 15: $randNum = 'F'; break; 
    } 
    $str .= $randNum; 
} 
return $str; 

}
$color = randomColor();
49、从网络下载文件

set_time_limit(0);
// Supports all file types
// URL Here:
$url = 'http://somsite.com/some_video.flv';
$pi = pathinfo($url);
$ext = $pi['extension'];
$name = $pi['filename'];

// create a new cURL resource
$ch = curl_init();

// set URL and other appropriate options
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
curl_setopt($ch, CURLOPT_AUTOREFERER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

// grab URL and pass it to the browser
$opt = curl_exec($ch);

// close cURL resource, and free up system resources
curl_close($ch);

$saveFile = $name.'.'.$ext;
if(preg_match("/¹/i", $saveFile))
$saveFile = md5(microtime(true)).'.'.$ext;

$handle = fopen($saveFile, 'wb');
fwrite($handle, $opt);
fclose($handle);
50、Alexa/Google Page Rank

function page_rank($page, $type = 'alexa'){

switch($type){ 
    case 'alexa': 
        $url = 'http://alexa.com/siteinfo/'; 
        $handle = fopen($url.$page, 'r'); 
        break; 
    case 'google': 
        $url = 'http://google.com/search?client=navclient-auto&ch=6-1484155081&features=Rank&q=info:';
        $handle = fopen($url.'http://'.$page, 'r'); 
        break; 
} 
$content = stream_get_contents($handle); 
fclose($handle); 
$content = preg_replace("~(n|t|ss+)~",'', $content); 
switch($type){ 
    case 'alexa': 
        if(preg_match('~<div class="data (down|up)"><img.+?>(.+?) </div>~im',$content,$matches)){ 
            return $matches[2]; 
        }else{ 
        return FALSE; 
        } 
        break; 
    case 'google': 
        $rank = explode(':',$content); 
        if($rank[2] != '') 
            return $rank[2]; 
        else
            return FALSE; 
        break; 
    default: 
        return FALSE; 
        break; 
} 

}
// Alexa Page Rank:
echo 'Alexa Rank: '.page_rank('techug.com');
echo '
';
// Google Page Rank
echo 'Google Rank: '.page_rank('techug.com', 'google');
51、强制下载文件

$filename = $_GET['file']; //Get the fileid from the URL
// Query the file ID
$query = sprintf("SELECT * FROM tableName WHERE id = '%s'",mysql_real_escape_string($filename));
$sql = mysql_query($query);
if(mysql_num_rows($sql) > 0){

$row = mysql_fetch_array($sql); 
// Set some headers 
header("Pragma: public"); 
header("Expires: 0"); 
header("Cache-Control: must-revalidate, post-check=0, pre-check=0"); 
header("Content-Type: application/force-download"); 
header("Content-Type: application/octet-stream"); 
header("Content-Type: application/download"); 
header("Content-Disposition: attachment; filename=".basename($row['FileName']).";"); 
header("Content-Transfer-Encoding: binary"); 
header("Content-Length: ".filesize($row['FileName'])); 

@readfile($row['FileName']); 
exit(0); 

}else{

header("Location: /"); 
exit; 

}
52、通过Email显示用户的Gravatar头像

$gravatar_link = 'http://www.gravatar.com/avatar/' . md5($comment_author_email) . '?s=32';
echo '<lt;img src="' . $gravatar_link . '" />';
53、通过cURL获取RSS订阅数

$ch = curl_init();
curl_setopt($ch,CURLOPT_URL,'https://feedburner.google.com/api/awareness/1.0/GetFeedData?id=7qkrmib4r9rscbplq5qgadiiq4');
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,2);
$content = curl_exec($ch);
$subscribers = get_match('/circulation="(.*)"/isU',$content);
curl_close($ch);
54、时间差异计算函数

function ago($time)
{

$periods = array("second", "minute", "hour", "day", "week", "month", "year", "decade");
$lengths = array("60","60","24","7","4.35","12","10");
$now = time();
$difference = $now - $time;
$tense = "ago";
for($j = 0; $difference >= $lengths[$j] && $j < count($lengths)-1; $j++) {
    $difference /= $lengths[$j];
}
$difference = round($difference);
if($difference != 1) {
    $periods[$j].= "s";
}
return "$difference $periods[$j] 'ago' ";

}
55、裁剪图片

$filename= "test.jpg";
list($w, $h, $type, $attr) = getimagesize($filename);
$src_im = imagecreatefromjpeg($filename);

$src_x = '0'; // begin x
$src_y = '0'; // begin y
$src_w = '100'; // width
$src_h = '100'; // height
$dst_x = '0'; // destination x
$dst_y = '0'; // destination y

$dst_im = imagecreatetruecolor($src_w, $src_h);
$white = imagecolorallocate($dst_im, 255, 255, 255);
imagefill($dst_im, 0, 0, $white);

imagecopy($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h);

header("Content-type: image/png");
imagepng($dst_im);
imagedestroy($dst_im);
56、检查网站是否宕机

function Visit($url){

$agent = "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)";$ch=curl_init();
curl_setopt ($ch, CURLOPT_URL,$url );
curl_setopt($ch, CURLOPT_USERAGENT, $agent);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch,CURLOPT_VERBOSE,false);
curl_setopt($ch, CURLOPT_TIMEOUT, 5);
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch,CURLOPT_SSLVERSION,3);
curl_setopt($ch,CURLOPT_SSL_VERIFYHOST, FALSE);
$page=curl_exec($ch);
//echo curl_error($ch);
$httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
if($httpcode>=200 && $httpcode<300) return true;
else return false;

}
if (Visit("http://www.google.com"))

echo "Website OK"."n";

else

echo "Website DOWN";

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