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<mb_preferred_mime_namemb_regex_set_options>
^Multibyte String FunctionsLast updated: Mon, 26 Oct 2026

mb_regex_encoding

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

mb_regex_encoding — Set/Get character encoding for multibyte regex

Description

function mb_regex_encoding(?string $encoding = null): string|bool

Set/Get character encoding for a multibyte regex.

Parameters

encoding

The encoding parameter is the character encoding. If it is omitted or null, the internal character encoding value will be used.

Return Values

If encoding is set, then Returns true on success or false on failure. In this case, the internal character encoding is NOT changed. If encoding is omitted, then the current character encoding name for a multibyte regex is returned.

Errors/Exceptions

As of PHP 8.0.0, a ValueError is thrown if encoding is an invalid encoding. Prior to PHP 8.0.0, an E_WARNING was emitted instead.

Changelog

Version Description
8.0.0 encoding is nullable now.
8.0.0 Now throws a ValueError if encoding is an invalid encoding. Previously, an E_WARNING was emitted and false was returned.

See Also


<mb_preferred_mime_namemb_regex_set_options>
^Multibyte String FunctionsLast updated: Mon, 26 Oct 2026