php preg_match_all结合str_replace替换内容中所有img_PHP
采集回来的图片img标签中,有好多javascript脚本和无用的信息,必需过替换自己想要的,比如alt。先看看要过滤的内容,我随便复制出来:
复制代码 代码如下:
sdfsdfsdf500){this.resized=true; this.style.width=500;}”>sfsdfsdfasdfsadf
500){this.resized=true; this.style.width=500;}”>sdfsadf
500){this.resized=true;this.style.width=500;}”>sdfsdf
要把上面替换成形如:
复制代码 代码如下: 其中src=”http://www.xxx.com/upimg/080330 /120D1232295023X0.gif” src=”http://www.xxx.com/upimg/080330 /120D1232295023X0.gif”这个地址要保留,因为图片用的都是源地址
方法大致是:先读取内容里的所以IMG标签,然后把每个IMG标签的SRC抽取出来,并且组合成自己的内容,最后进行替换。
preg_match_all就是我想要的函数,它能够把正则表达式匹配到的内容建立一个三维数组,你可以对它们进行遍历查找替换,不太了解的请查查手册,这里不作具体介绍。函数代码:
复制代码 代码如下:
function replace($str)
{
preg_match_all(”/]+>/isU”, $str, $arr);
for($i=0,$j=count($arr[0]);$i$str = str_replace($arr[0][$i],””,$str);
}
return $str;
}

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