php实现遍历目录压缩图片

<?php
/**
 * 遍历目录压缩图片
 */
function zip_img($filename){
    $percent = 1;
    // 获取新的尺寸
    $imginfo = list($width, $height) = getimagesize($filename);
    $type = $imginfo['mime'];
    $new_width = $width * $percent;
    $new_height = $height * $percent;
    while($new_width>620 || $new_height>960){
        $percent = 0.8;
        $new_width = $new_width * $percent;
        $new_height = $new_height * $percent;
    }
    $image_p = imagecreatetruecolor($new_width, $new_height);  

    if(strpos($type,'png')){
        $image = imageCreateFromPng($filename);
        //分配颜色 + alpha，将颜色填充到新图上  
        $alpha = imagecolorallocatealpha($image_p, 0, 0, 0, 127);  
        imagefill($image_p, 0, 0, $alpha);  
        imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
        imagesavealpha($image_p, true);  
        imagepng($image_p, $filename,5);  //保存图片名字为：123.png
    }else if(strpos($type,'jpeg')){
        $image = imagecreatefromjpeg($filename);
        imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
        imagejpeg($image_p, $filename, 55);//保存图片名字为：123.jpg
    }else{
        echo '图片类型：'.$type.'暂时不支持压缩！';
    }
}


function read_all ($dir){
    if(!is_dir($dir)) return false;
    $handle = opendir($dir);
    if($handle){
        while(($fl = readdir($handle)) !== false){
            $temp = $dir.DIRECTORY_SEPARATOR.$fl;
            if(is_dir($temp) && $fl!='.' && $fl != '..'){
                echo '目录：'.$temp.'<br>';
                read_all($temp);
            }else{
                if($fl!='.' && $fl != '..'){
                    zip_img($temp);
                    echo '文件：'.$temp.'<br>';
                }
            }
        }
    }
}

read_all('D:\000\code\WWW\test\yunparse\cache\2017\12-25');
echo '压缩完成'.'<br>';
?>

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