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Description

Check if a string is ASCII.

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.

Usage

$bool = wpdb::check_ascii( $string );

Parameters

$string

( string ) required – String to check.

Returns

bool True if ASCII, false if not.

Source

File name: wordpress/wp-includes/wp-db.php
Lines:

  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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