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

File: test.php
echo "源码：
";
show_source('./a.php');
echo "
去除注释后：
";
highlight_string(removeComment(file_get_contents('./a.php')));

/**
 * 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", '', 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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