How to implement html content replacement in php

php How to replace html content: First create an HTML sample file; then modify the content in html through the "preg_match_all($pattern,htmlspecialchars_decode($a),$match);" method.

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The operating environment of this tutorial: windows7 system, PHP5. Version 6, this method is suitable for all brands of computers.

php modifies the content in html

It is known that the following piece of html

$a="<p><img src=\"/upload/store/1/ue/image/1568282125833264.png\" title=\"1568282125833264.png\" alt=\"1.png\"/><img src=\"http://dimg04.c-ctrip.com/images/300q12000000rq2t956CB.jpg\" alt=\"undefined\"/><img src=\"https://dimg04.c-ctrip.com/images/300m12000000sdsca92E2.jpg\"/><img src=\"https://dimg04.c-ctrip.com/images/300w12000000rutmrD6CB.jpg\" alt=\"undefined\"/><img src=\"https://dimg04.c-ctrip.com/images/300u12000000rorex415F.jpg\" alt=\"undefined\"/><img src=\"http://dimg04.c-ctrip.com/images/300k12000000rsyxgBA05.jpg\" alt=\"undefined\"/></p>"

contains http, https and the url of the local relative path

Common usage:

$pattern="/<img.*?src=[\&#39;|\"](.*?)[\&#39;|\"].*?[\/]?>/";
preg_match_all($pattern,htmlspecialchars_decode($a),$match);
if(!empty($match[1])){
    print_r($match[1]);
}else{
echo "没得";
}

First match all in the loop $match[1]

After the loop foreach($match[1 ] as $val){preg_replace('#src="'.$val.'"/#is', 'src="aaaaa/',$a);}

I think this is quite troublesome

Upgrade usage:

$host="http://mp.csdn.net"
$newContent =  preg_replace_callback("/<img.*?src=[\&#39;|\"](.*?)[\&#39;|\"].*?[\/]?>/", function($m) use($host){

   if(strpos($m[1],&#39;http://&#39;) || strpos($m[1],&#39;https://&#39;)){
       return $m[0];
   }else{
       $img=preg_replace(&#39;#src="/#is&#39;, &#39;src="&#39;.$host.&#39;/&#39;,$m[0]);
       return $img;
   }
}, $a);

Although this method is rarely used, the effect is super good when batch processing!

I personally like this kind of closure function. The code is very readable

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