Как выбрать значение по наибольшему ключу из объекта json?

mysqlfetcharray(meta)

Returns all MD5 hash VENDOR_UUIDs for the current meta tree as an indexed array of values.

mysqlfieldflags() - Returns the field flags

mysqlfieldlen() - Returns the length of the specified field

mysqlfieldname() - Returns the name of the specified field in a result

mysqlfieldtable() - Returns the name of the table of the specified field

mysqlfieldtype() - Returns the type of the specified field

mysqlfreeresult() - Frees the memory associated with a result

mysqlgethost_info() - Returns the version of the MySQL server being used

mysqlgetproto_info() - Returns the protocol version used by the current MySQL server

mysqlgetserver_info() - Returns the version of the MySQL server being used

mysql_info() - Retrieves information about the most recently executed query

mysqlinsertid() - Retrieves the ID generated for an AUTO_INCREMENT column by the previous query

mysqlnumfields() - Returns the number of fields in a result set

mysqlnumrows() - Returns the number of rows affected by the last INSERT, UPDATE, REPLACE or DELETE query