php正则提取html图片(img)src地址与任意属性

简单版：

<?php
header("Content-Type: text/html;charset=utf-8");

$str = "<div class="ui-block-a" align="center">
        <a href="online-39.html"><img class="lazy" width="131" height="177" src="http://www.smsyun.com/uploads/image/20140620/2014052010425.jpg"/>
        <h3>2014年</h3></a>
      </div>";

$imgpreg = "/<img (.*?) src="(.+?)".*?>/";
preg_match($imgpreg,$str,$img);
$mycount=count($img)-1;
 $imgval = $iim[$mycount];
if(!empty($imgval)){
    echo $imgval;
}else{
    echo "no";
}
?>

详细版：

<?php
/*PHP正则提取图片img标记中的任意属性*/
$str = "<center><img src="/uploads/images/20100516000.jpg" height="120" width="120"><br />PHP正则提取或更改图片img标记中的任意属性</center>";

//1、取整个图片代码
preg_match("/<s*imgs+[^>]*?srcs*=s*("|")(.*?)\1[^>]*?/?s*>/i",$str,$match);
echo $match[0];

//2、取width
preg_match("/<img.+(width="?d*"?).+>/i",$str,$match);
echo $match[1];

//3、取height
preg_match("/<img.+(height="?d*"?).+>/i",$str,$match);
echo $match[1];

//4、取src
preg_match("/<img.+src="?(.+.(jpg|gif|bmp|bnp|png))"?.+>/i",$str,$match);
echo $match[1];

/*PHP正则替换图片img标记中的任意属性*/
//1、将src="/uploads/images/20100516000.jpg"替换为src="/uploads/uc/images/20100516000.jpg")
print preg_replace("/(<img.+src="?.+)(images/)(.+.(jpg|gif|bmp|bnp|png)"?.+>)/i","${1}uc/images/${3}",$str);
echo "<hr/>";

//2、将src="/uploads/images/20100516000.jpg"替换为src="/uploads/uc/images/20100516000.jpg",并省去宽和高
print preg_replace("/(<img).+(src="?.+)images/(.+.(jpg|gif|bmp|bnp|png)"?).+>/i","${1} ${2}uc/images/${3}>",$str);
?>