wpdb::parse_db_host( string $host ): array|false

Source

public function parse_db_host( $host ) {
	$socket  = null;
	$is_ipv6 = false;

	// First peel off the socket parameter from the right, if it exists.
	$socket_pos = strpos( $host, ':/' );
	if ( false !== $socket_pos ) {
		$socket = substr( $host, $socket_pos + 1 );
		$host   = substr( $host, 0, $socket_pos );
	}

	/*
	 * We need to check for an IPv6 address first.
	 * An IPv6 address will always contain at least two colons.
	 */
	if ( substr_count( $host, ':' ) > 1 ) {
		$pattern = '#^(?:\[)?(?P<host>[0-9a-fA-F:]+)(?:\]:(?P<port>[\d]+))?#';
		$is_ipv6 = true;
	} else {
		// We seem to be dealing with an IPv4 address.
		$pattern = '#^(?P<host>[^:/]*)(?::(?P<port>[\d]+))?#';
	}

	$matches = array();
	$result  = preg_match( $pattern, $host, $matches );

	if ( 1 !== $result ) {
		// Couldn't parse the address, bail.
		return false;
	}

	$host = ! empty( $matches['host'] ) ? $matches['host'] : '';
	// MySQLi port cannot be a string; must be null or an integer.
	$port = ! empty( $matches['port'] ) ? absint( $matches['port'] ) : null;

	return array( $host, $port, $socket, $is_ipv6 );
}

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