Multibyte String 函数
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mb_regex_encoding

(PHP 4 >= 4.2.0, PHP 5)

mb_regex_encoding — Returns current encoding for multibyte regex as string

说明

mixed mb_regex_encoding ([ string $encoding ] )

Returns the current encoding for a multibyte regex as a string.

参数

encoding

encoding 参数为字符编码。如果省略，则使用内部字符编码。

返回值

Returns the character encoding used by multibyte regex functions.

参见

Multibyte String 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: Returns current encoding for multibyte regex as string

用户评论:

php dot net at phor dot net (31-Aug-2010 09:40)

Beware, mb_regex_encoding does not support the same set of encodings as listed in mb_list_encodings.php

Example:

<?php
mb_internal_encoding('CP936');
mb_regex_encoding('CP936'); # this line produces an error
 ?>

Anonymous (28-Jun-2009 06:07)

To change algo the regex_encodign
<?php
echo "current mb_internal_encoding: ".mb_internal_encoding()."<br />";
echo "changing mb_internal_encoding to UTF-8<br />";
mb_internal_encoding("UTF-8");
echo "new mb_internal_encoding: ".mb_internal_encoding()."<br />";

echo "current mb_regex_encoding: ".mb_regex_encoding()."<br />";
echo "changing mb_regex_encoding to UTF-8<br />";
mb_regex_encoding('UTF-8');
echo "new mb_regex_encoding: ".mb_regex_encoding()."<br />";
?>

zl at zl dot hu (29-May-2009 02:05)

Return values vary in setting and getting:

<?php
  echo mb_regex_encoding();
  // returns encoding name as a string
?>

<?php
  echo mb_regex_encoding("UTF-8");
  // returns true (success) of false as a boolean
?>

/me (02-Feb-2008 02:30)

Note, that the regex encoding is only set to the initial internal character encoding. If you change the internal encoding in your script with mb_internal_encoding() the regex encoding does not change. For example:

<?php
echo "current mb_internal_encoding: ".mb_internal_encoding()."<br />";
echo "current mb_regex_encoding: ".mb_regex_encoding()."<br />";
echo "changing mb_internal_encoding to UTF-8<br />";
mb_internal_encoding("UTF-8");
echo "new mb_internal_encoding: ".mb_internal_encoding()."<br />";
echo "new mb_regex_encoding: ".mb_regex_encoding()."<br />";
?>

This code might output (depending on your initial internal character encoding):

current mb_internal_encoding: ISO-8859-1
current mb_regex_encoding: ISO-8859-1
changing mb_internal_encoding to UTF-8
new mb_internal_encoding: UTF-8
new mb_regex_encoding: ISO-8859-1

Furthermore the sentence "The default value is the internal character encoding." in the documentation might be misleading because the initial default value of the regex encoding is meant, and not the default value for the optional encoding parameter.