PHP爬虫 获取 Bilibili 视频封面图

<?php

function curl($url)
{

$ch = curl_init();
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5000);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 8_0 like Mac OS X) AppleWebKit/600.1.3 (KHTML, like Gecko) Version/8.0 Mobile/12A4345d Safari/600.1.4'));
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch, CURLOPT_REDIR_PROTOCOLS, -1);
$contents = curl_exec($ch);
curl_close($ch);
return $contents;

}

function getBilibiliAVCover($avNum)
{

$contents = curl('https://m.bilibili.com/video/' . $avNum . '.html');
preg_match("~\"pic\":\"(.*?)\"~", $contents, $matches);
if (count($matches) == 0) {
    echo '没有找到相应的图片，请换个 av 号试一下。';
    exit;
}
$img = file_get_contents($matches[1]);
file_put_contents('default.png', $img);
echo '<img src="default.png">';

}

getBilibiliAVCover('av417622790');
exit;

?>

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