php正则抓取图片(抓取图片403处理)

<?php
//抓取页面图片的时候防止图片403(防止盗链)
echo "<meta name='referrer' content='no-referrer'>";
$list = file_get_contents($url);


$k = preg_match_all('/<img [^>]* />/',$list,$data);
$m = preg_grep('/alt/',$data[0]);
foreach($m as $v){
        echo $v.'<br>';
}