PHP 之去除代码中的注释

<?php

/**
 * Created by PhpStorm.
 * User: Yang
 * Date: 2019/10/16
 * Time: 10:25
 */

// 计算和
// 计算和
// 计算和
$a = 1;
$b = 2;
$c = $a+$b; //总和

/*
 * 求和函数
 */
function sum($a, $b) {

    return $a + $b; //返回值
}

#  第二种注释
$a = 1;
$b = 2;
## 求乘积
$c = $a * $b; #     结果

//特殊
$usedFuncs = "abcd";
preg_split("//is", implode("", $usedFuncs), -1, PREG_SPLIT_NO_EMPTY);

/**
 * Created by PhpStorm.
 * User: 25754
 * Date: 2019/10/17
 * Time: 9:54
 */

function removeComment($content)
{
    return preg_replace("/(\/\*(\s|.)*?\*\/)|(\/\/.(\s|.*)\n)|(#(\s*)?(.*))/", ‘‘, str_replace(array("\r\n", "\r"), "\n", $content));
}

$content = file_get_contents("./test.php");
echo removeComment($content);

$a = 1;
$b = 2;
$c = $a+$b; 

function sum($a, $b) {

    return $a + $b; }


$a = 1;
$b = 2;

$c = $a * $b; 

$usedFuncs = "abcd";
preg_split("