使用正则去除php代码中的注释方法

<?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;

echo "源码<br />";
show_source('./a.php');
echo "<hr />去除注释后<br />";
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));
}

(\/\.\\/) 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

<?php 
 
$s = '/aaaa 
sss 
//'; 
 
preg_match('@/\.?\/@s', $s, $match); 
 
var_dump($match); 

array(1) {
 [0]=>
 string(15) "/aaaa 
sss 
/"
}

<?php 
$str = "  
a = b; //asdf //saf 
b = c; //asdf 
  "; 
$reg = '@\s//.$@m'; 
 
$res = preg_replace($reg,'',$str); 
 
echo $res; 

a = b; 
b = c; 

local test = "int x; / xx / xx/ int y; / y /" 
 
function string.gfind(test, patten) 
 local i,j = 0,0; 
 return function() 
  i,j = string.find(test, patten, j+1) 
  if(i == nil) then -- end find 
   return nil  
  end  
  return string.sub(test, i, j) 
 end  
end 
 
 
for v in string.gfind(test, "/%.-%/") do 
 print(v) 
end