【php】利用preg_match函数匹配图片

1.代码：

<?php
$str='<a href=""><img src="http://www.zhen.com/uploadfile/2012/1205/20121205112558940.jpg"></a><a href=""><img src="http://www.zhen.com/uploadfile/2012/1205/20121205112558940.jpg"></a>';
preg_match_all('/<img[^>]*src=[\'"]?([^>\'"\s]*)[\'"]?[^>]*>/i', $str, $out);
echo "<pre>";
print_r($out);
?>

2.结果：

<pre>Array
(
    [0] => Array
        (
            [0] => <img src="http://www.zhen.com/uploadfile/2012/1205/20121205112558940.jpg">//匹配完整内容
            [1] => <img src="http://www.zhen.com/uploadfile/2012/1205/20121205112558940.jpg">
        )

    [1] => Array
        (
            [0] => http://www.zhen.com/uploadfile/2012/1205/20121205112558940.jpg  //只匹配（）中规定的内容
            [1] => http://www.zhen.com/uploadfile/2012/1205/20121205112558940.jpg
        )

)

3.如下：

function spider_photos($str) {
	$field = $GLOBALS['field'];
	$_POST[$field.'_url'] = array();
	preg_match_all('/<img[^>]*src=[\'"]?([^>\'"\s]*)[\'"]?[^>]*>/i', $str, $out);
	$array = array();
	if (isset($out[1]))foreach ($out[1] as $v) {
		$_POST[$field.'_url'][] = $v;
	}
	return '1';
}