wpdb::check_ascii( string $string )

Check if a string is ASCII.

Description Description

The negative regex is faster for non-ASCII strings, as it allows the search to finish as soon as it encounters a non-ASCII character.

Parameters Parameters


(string) (Required) String to check.

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Return Return

(bool) True if ASCII, false if not.

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Source Source

File: wp-includes/wp-db.php

	protected function check_ascii( $string ) {
		if ( function_exists( 'mb_check_encoding' ) ) {
			if ( mb_check_encoding( $string, 'ASCII' ) ) {
				return true;
		} elseif ( ! preg_match( '/[^\x00-\x7F]/', $string ) ) {
			return true;

		return false;

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Changelog Changelog

Version Description
4.2.0 Introduced.

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