php获取图片属性

例子：

<?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*img\s+[^>]*?src\s*=\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);