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

addslashes() - 使用反斜线引用字符串
addcslashes() - 以 C 语言风格使用反斜线转义字符串中的字符
htmlentities() - 将字符转换为 HTML 转义字符
htmlspecialchars() - 将特殊字符转换为 HTML 实体
nl2br() - 在字符串所有新行之前插入 HTML 换行标记
stripslashes() - 反引用一个引用字符串
stripcslashes() - 反引用一个使用 addcslashes 转义的字符串
preg_quote() - 转义正则表达式字符

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用户贡献的备注 3 notes

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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\. \(can you hear me\?\)

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George Adams ¶

19 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)

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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).