How to implement regular expression to remove spaces in php

php regular way to remove spaces: first create a PHP sample file; then define a string with spaces; finally pass "preg_replace("/(\s|\ \;| |\xc2\xa0 )/","",$str);" can be used to remove spaces in the string.

#The operating environment of this article: Windows 7 system, PHP version 7.1, Dell G3 computer.

php Regularly removes e388a4556c0f65e1904146cc1a846bee 94b3e26ee717c64999d7867364b1b4a3 spaces  

$str='
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p><strong><span style="font-size: 18px;">Factory Supply High Quality Maitake Mushroom Extract Powder Bulk</span></strong></p>
<p> </p>
<p> </p>Product Name
<p> </p>&#39;;
$uuu=preg_replace("/(\s|\&nbsp\;|　|\xc2\xa0)/","",$str);
echo str_replace(&#39;<p></p>&#39;, &#39;&#39;, $uuu);

is perfect.

How does PHP's str_replace function replace e388a4556c0f65e1904146cc1a846bee076402276aae5dbec7f672f8f4e5cc8194b3e26ee717c64999d7867364b1b4a3?

How to replace e388a4556c0f65e1904146cc1a846bee076402276aae5dbec7f672f8f4e5cc8194b3e26ee717c64999d7867364b1b4a3 with str_replace function of php 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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