_wp_can_use_pcre_u( bool $set = null )

Parameters

$setbooloptional

- Used for testing only null : default - get PCRE/u capability false : Used for testing - return false for future calls to this function 'reset': Used for testing - restore default behavior of this functionDefault: null

Used by · 2

• _mb_strlen()Internal compat function to mimic mb_strlen().
• _mb_substr()Internal compat function to mimic mb_substr().

Source

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33function _wp_can_use_pcre_u( $set = null ) {34	static $utf8_pcre = 'reset';35 36	if ( null !== $set ) {37		$utf8_pcre = $set;38	}39 40	if ( 'reset' === $utf8_pcre ) {41		// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- intentional error generated to detect PCRE/u support.42		$utf8_pcre = @preg_match( '/^./u', 'a' );43	}44 45	return $utf8_pcre;46}

History

Introduced in 4.2.2. Unchanged from 6.7.7 through 7.1.0.

1. 6.7.7
2. 6.8.8
3. 6.9.7
4. 7.0.4
5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

About this page

Parsed data

Generated from the wordpress-develop 6.7.7 tag, from src/wp-includes/compat.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

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