<?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);
?>


/*
*获取html指定标签的相关属性
*@param string $content 要解析HTML内容
*@param string $attr 指定要获取的标签属性
*@param string $tag  指定解析标签
*@return  array 
*/

function get_html_attr_by_tag($content="",$attr="src",$tag="img"){
    
    $arr=array();
    
    $cache_arr=array();
    
    $attr=explode(',',$attr);
    
    $tag=explode(',',$tag);
    
    foreach($tag as $i=>$t){
        
        foreach($attr as $a){
            
            preg_match_all("/<\s*".$t."\s+[^>]*?".$a."\s*=\s*(\'|\")(.*?)\\1[^>]*?\/?\s*>/i",$content,$match);
            
            foreach($match[2] as $n=>$m){
                
                $arr[$t][$n][$a]=$m;
            
            }
            
        }
        
    }
    
    return $arr;//array
    
}


/**
 * 获取html指定标签的相关属性*@param string $content 要解析HTML内容*@param string $attr 指定要获取的标签属性*@param string $tag 指定解析标签*@return array
 */
function get_html_attr_by_tag($content = "", $attr = "src", $tag = "img")
{
    $arr = array();
    $cache_arr = array();
    $attr = explode(',', $attr);
    $tag = explode(',', $tag);
    foreach ($tag as $i => $t) {
        foreach ($attr as $a) {
            preg_match_all("/<\s*" . $t . "\s+[^>]*?" . $a . "\s*=\s*(\'|\")(.*?)\\1[^>]*?\/?\s*>/i", $content, $match);
            foreach ($match[2] as $n => $m) {
                $arr[$t][$n][$a] = $m;
            }
        }
    }
    return $arr;
    // array
}