How to delete comments using php regular expressions

php regular way to delete comments: first create a PHP sample file a; then create a test file; then use the "highlight_string(removeComment(file_get_contents('./a.php')));" method Just delete the comment.

#The operating environment of this article: Windows7 system, PHP7.1, Dell G3 computer.

Regular removal of comments in php code

## Strange needs...

Test code

File: a.php

<?php
/**
 * 加法计算
 * 测试
 */
// 设定$a的值
$a = 10;
// 设定$b的值
$b = 5;
// 加法
$c = $a + $b;
# 输出结果
echo $c;

File: test.php

echo "源码：<br />";
show_source(&#39;./a.php&#39;);
echo "<hr />去除注释后：<br />";
highlight_string(removeComment(file_get_contents(&#39;./a.php&#39;)));/**
 * 去除PHP代码注释
 * @param  string $content 代码内容
 * @return string 去除注释之后的内容
 */function removeComment($content){    
 return preg_replace("/(\/\*.*\*\/)|(#.*?\n)|(\/\/.*?\n)/s", &#39;&#39;, 
 str_replace(array("\r\n", "\r"), "\n", $content));
}

Test output

Execution test.php, the output is as follows:

Regular analysis

(\/\*.*\*\/)   匹配 /* */
(#.*?\n)       匹配 #      遇到第一个回车后结束
(\/\/.*?\n)    匹配 //     遇到第一个回车后结束

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