How to remove spaces in php using regular expressions

php method to use regular expressions to remove spaces: first create a PHP sample file; then use the regular expression "preg_replace('/[\n\r\t]/','',$html);" Just remove the spaces.

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##php Use regular rules to remove spaces

php’s str_replace function replaces e388a4556c0f65e1904146cc1a846bee076402276aae5dbec7f672f8f4e5cc8194b3e26ee717c64999d7867364b1b4a3

The method is as follows

$html="<p>fdasf</p>";
 
　　echo $string = str_replace(array("<p>","","</p>"),"",$html);
 
　　br<http://bbs.houdunwang.com/>
 
若是<p>     内容</p>替换成<p>内容</p><p>                 
content</p>替换成<p>contend</p>（空格是tab键和空格键  混合的  都有可能）方法如下
 
　　$html=preg_replace(&#39;/[\n\r\t]/&#39;,&#39;&#39;,$html);//去空格
 
若是<p>后面跟了若干个，再是内容 
 
　　<p>     内容</p>
 
　　替换成<p>内容</p>
 
　　<p>   content</p>
 
　　替换成<p>contend</p>

　<?php
 
　　$html="<p>
　　内容</p>替换成<p>内容</p>
　　<p>content</p>替换成<p>contend</p>";方法如下
 
　　$html=trim($html);
 
　　$html=str_replace(PHP_EOL,"",$html);
 
　　$html=str_replace(" ","",$html);
 
　　$html=preg_replace(&#39;/\s+/&#39;,&#39;&#39;,$html);
 
　　$html=preg_replace(&#39;/[\n\r\t]/&#39;,&#39;&#39;,$html);
 
　　echo "{$html}";
 
　　?>
 
str_replace("<p><br\/><\/p>","",$htmlstr);

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