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This article mainly explains "how to achieve PHP to add a backslash before quotation marks". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to achieve PHP to add a backslash before quotation marks".

In general, the server space provided by the space provider defaults to the PHP instruction magic_quotes_gpc, which is on, that is, open. At this point, you can use the stripslashes () function to remove the automatically added backslash. The usage is: for example, if the variable containing a string is $str, then use the stripslashes () function to process the string: stripslashes ($str), and the output is to remove the backslash.

If you encounter a backslash in the output, you can use the stripslashes () function to deal with the output, that is, $str=stripslashes ($str), and save it to remove the backslash contained in the output.

But there is another problem, that is, because the local PHP instruction magic_quotes_gpc is off, if you use this function, the normal backslash will be removed. This is not what we want.

The solution is to use the function get_magic_quotes_gpc () for detection, removing the backslash if the state is open and not removing the backslash if the state is closed.

The program code is as follows:

The copy code is as follows:

$str=$_POST ["str"]; / / read the contents of str and assign values to the $str variable

If (get_magic_quotes_gpc ()) {/ / if get_magic_quotes_gpc () is open

$str=stripslashes ($str); / / process the string

}

This article was revised 10:08:03 on April 25, 2012 as follows:

Here are three ways to solve this problem:

1. Modify PHP configuration file php.ini

This method is only suitable for the case that you have the right to manage the server, and if you use the virtual space, you can only use the latter two methods.

Set magic_quotes_gpc, magic_quotes_runtime, and magic_quotes_sybase to off in the PHP configuration file php.ini. As follows:

The copy code is as follows:

Magic_quotes_gpc = Off

Magic_quotes_runtime = Off

Magic_quotes_sybase = Off

2 using .htaccess files

This method is only supported by the server if the server supports htaccess, and the current server generally supports it.

Add the following sentence to the .htaccess file under the program directory:

Php_flag magic_quotes_gpc Off

3 masking in the code

This method is the most portable and can be used as long as it supports PHP, regardless of the configuration of the server.

Add the following code at the beginning of all PHP files

The copy code is as follows:

If (get_magic_quotes_gpc ()) {

Function stripslashes_deep ($value) {

$value=is_array ($value)? array_map ('stripslashes_deep',$value): stripslashes ($value)

Return $value

}

$_ POST=array_map ('stripslashes_deep',$_POST)

$_ GET=array_map ('stripslashes_deep',$_GET)

$_ COOKIE=array_map ('stripslashes_deep',$_COOKIE)

$_ REQUEST=array_map ('stripslashes_deep',$_REQUEST)

}

Thank you for your reading, the above is "how to achieve PHP in front of the backslash" content, after the study of this article, I believe you on how to achieve PHP in front of the backslash in front of the problem have a deeper understanding, the specific use of the need for you to practice and verify. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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