str_replace双引号和单引号

问题描述：

I have a simple PHP script that should escape both single and double quotes with a backslash. Here is my code:

$output = str_replace('"','\"',$input);
$output = str_replace("'","\'",$output);
return $output;

Problem is, it only escapes the double quote, so a string like

"This" is a 'string'

parses out to be

\"This\" is a 'string'

not

\"This\" is a \'string\'

If I change the second line to

$output = str_replace("'","asdf",$output);

I get

\"This\" is a asdfstringasdf

Any ideas what is going wrong?

Thanks

我有一个简单的PHP脚本，它应该用反斜杠转义单引号和双引号。这是我的代码： p>

  $ output = str_replace（'“'，'\''，$ input）; 
 $ output = str_replace（”'“，”\  '“，$ output）; 
return $ output; 
  code>  pre> 
 
 问题是，它只会转义双引号，所以像 p> 
 
这样的字符串 n 
 “This”是一个'字符串'
  code>  pre> 
 
 解析为 p> 
 
 
   \“这个\”是一个'字符串'
  code>  pre> 
 
 不是 p> 
 
 
  \“这个\”是一个\  'string \'
  code>  pre> 
 
 如果我将第二行更改为 p> 
 
 
  $ output = str_replace（“'”  ，“asdf”，$ output）; 
  code>  pre> 
 
 我得到 p> 
 
 
  \“这个\”是一个asdfstringasdf  
  code>  pre> 
 
 任何想法出了什么问题？ p> 
 
 
谢谢 p> 
  div>

答

Problem solved. I was viewing the output in my browser's console, which for some reason was showing the backslash for double quotes, but not singles. View source showed that it was working properly.

答

Try this:

$output = str_replace("\"","\\\"",$input);
$output = str_replace("\'","\\\'",$output);
return $output;

The problem is that ' inside a string, should be noted as \' , as it is an escape character. The backslash \ is a double \ as well inside a string.

Let me know if this works.

答

I didn't have a problem with your code, my test is below:

<?php

    $input = '"This" is a '."'".'String'."'";
    echo $input.'<br />';
    //Echos  "This" is a 'String'

    $output = str_replace('"','\"',$input);
    $output = str_replace("'","\'",$output);
    echo $output;
    //Echos  \"This\" is a \'String\'

Edited

Irrelevant now, OP figured it out :D

str_replace双引号和单引号

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