How to remove comments in php using regular expressions

php uses regular expressions to remove comments: ["/(\/\*.*\*\/)|(#.*?\n)|(\/\/.*?\n) /s"]. [(\/\/.*?\n)] means matching [//] and ends after encountering the first carriage return.

Specific method:

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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:

Execute 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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