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$url='<img class="trans"src="http://s0.ifengimg.com/2016/05/24/1_2988ea16.jpg"alt="二线房价猛涨 环京置业9000/平起"title="二线房价猛涨 环“ />';
$content=preg_match_all('/<img.*?src=("|\')([^\1]+?)\1[^>]*?>/i', $url, $matches);
echo "<pre>";
print_r($matches[2]);
echo "</pre>";
/*
Array
(
[0] => http://s0.ifengimg.com/2016/05/24/1_2988ea16.jpg
)
*/
$content=preg_match_all('/\<img.*?src=[\"|\']?([^\"]+)[\"|\']?\s*.*?>/i', $url, $matches);