}

	/**
	 * Takes a phone number and prepares it for the href attribute of a link.
	 *
	 * Removes all non-alphanumeric characters, converts letters to dial pad
	 * digits, and prepends a country dialing code if the number is 10 digits or
	 * less.
	 *
	 * @param  string $number The phone number to prepare.
	 * @return string A version of the phone number provided with letters converted to dial pad digits, non-numeric characters removed, and a country code prepended if the length of the provided number was 10 or less.
	 */
	public static function prepare_phone_number_for_link( $number ) {
		// get rid of anything that isn't a digit or a letter.
		$number = preg_replace( '/[^0-9A-Za-z]+/', '', $number );

		// convert letters to digits.
		$number = preg_replace( '/a|b|c/', '2', strtolower( $number ) );
		$number = preg_replace( '/d|e|f/', '3', strtolower( $number ) );
		$number = preg_replace( '/g|h|i/', '4', strtolower( $number ) );
		$number = preg_replace( '/j|k|l/', '5', strtolower( $number ) );
		$number = preg_replace( '/m|n|o/', '6', strtolower( $number ) );
		$number = preg_replace( '/p|q|r|s/', '7', strtolower( $number ) );
		$number = preg_replace( '/t|u|v/', '8', strtolower( $number ) );