quotemeta

(PHP 4, PHP 5, PHP 7, PHP 8)

quotemeta转义元字符集

说明

quotemeta(string $string): string

返回 在下面这些特殊字符前加 反斜线(\) 转义后的字符串。 这些特殊字符包含:

. \ + * ? [ ^ ] ( $ )

参数

string

输入字符串

返回值

返回 元字符集被转义后的 字符串,如果输入字符串string为空, 则返回 false

示例

示例 #1 quotemeta() 示例

<?php

var_dump
(quotemeta('PHP is a popular scripting language. Fast, flexible, and pragmatic.'));
?>

以上示例会输出:

string(69) "PHP is a popular scripting language\. Fast, flexible, and pragmatic\."

注释

注意: 此函数可安全用于二进制对象。

参见

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User Contributed Notes 3 notes

up
13
kumarkulandai at gmail dot com
15 years ago
<?php
$str
= "Hello world. (can you hear me?)";
echo
quotemeta($str);
?>

The output of the code above will be:
Hello world\. \(can you hear me\?\)
up
7
George Adams
18 years ago
Took me a while to realize this was NOT the command I wanted for escaping potentially harmful characters in a string that would be used as part of a system command.  Instead, I needed either escapeshellarg() (http://www.php.net/manual/en/function.escapeshellarg.php) or escapeshellcmd() (http://www.php.net/manual/en/function.escapeshellcmd.php)
up
4
Anonymous
23 years ago
This function escapes characters that have special meaning in regular expressions.  preg_quote() <http://php.net/manual/en/function.preg-quote.php> has similar functionality, but is more powerful since it escapes more characters (including one user-specified character).
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