_mb_ord( string $string, "UTF-8"|null $encoding = null ): int|false

211function _mb_ord( $string, $encoding = null ) {212	if ( ! is_string( $string ) || '' === $string || ( isset( $encoding ) && 'UTF-8' !== $encoding ) ) {213		return false;214	}215 216	$byte_length    = 0;217	$invalid_length = 0;218	$found_count    = _wp_scan_utf8( $string, $byte_length, $invalid_length, null, 1 );219 220	if ( 1 !== $found_count ) {221		return false;222	}223 224	// These are valid code points, so no further validation is required.225	$b0 = ord( $string[0] );226 227	switch ( $byte_length ) {228		case 1:229			return $b0;230 231		case 2:232			return (233				( ( $b0 & 0x1F ) << 6 ) |234				( ( ord( $string[1] ) & 0x3F ) )235			);236 237		case 3:238			return (239				( ( $b0 & 0x0F ) << 12 ) |240				( ( ord( $string[1] ) & 0x3F ) << 6 ) |241				( ( ord( $string[2] ) & 0x3F ) )242			);243 244		case 4:245			return (246				( ( $b0 & 0x07 ) << 18 ) |247				( ( ord( $string[1] ) & 0x3F ) << 12 ) |248				( ( ord( $string[2] ) & 0x3F ) << 6 ) |249				( ( ord( $string[3] ) & 0x3F ) )250			);251	}252 253	return false;254}