How to remove php regular expression br

php Regular way to remove br: First create a PHP sample file; then use the str_replace function and the regular expression "str_replace("e388a4556c0f65e1904146cc1a846beec16cfaf09ec2901d2f76abdf1ba64e098a45c867fd727fc770712bce9321033f" ,"",$htmlstr);" just replace br.
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##The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

phpRegular How to remove br?

How does PHP's str_replace function replace e388a4556c0f65e1904146cc1a846bee076402276aae5dbec7f672f8f4e5cc8194b3e26ee717c64999d7867364b1b4a3?

The code 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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