$url = '';
$cont = file_get_contents($url);

//打印出match   
$data = getimgs($cont);  
foreach ($data as $k => $v) {
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    echo '<br>';
} 

function getimgs($str) {
    $reg = '/((http|https):\/\/)+(\w+\.)+(\w+)[\w\/\.\-]*(jpg|gif|png)/';
    $matches = array();
    preg_match_all($reg, $str, $matches);
    foreach ($matches[0] as $value) {
        $data[] = $value;
    }
    return $data;
}

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