wpdb::db_version()

Retrieves the database server version.

Return

(string|null) Version number on success, null on failure.

Source

File: wp-includes/class-wpdb.php 

	public function db_version() {
		if ( $this->use_mysqli ) {
			$server_info = mysqli_get_server_info( $this->dbh );
		} else {
			$server_info = mysql_get_server_info( $this->dbh );
		}
		return preg_replace( '/[^0-9.].*/', '', $server_info );
	}

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Changelog

Changelog
Version Description
2.7.0 Introduced.