shm_put_var Inserts or updates a variable in shared memory boolshm_put_var intshm_identifier intvariable_key mixedvariable Inserts or updates a variable with a given variable_key. All variable-types are supported. &return.success; Warnings (E_WARNING level) will be issued if shm_identifier is not a valid SysV shared memory index or if there was not enough shared memory remaining to complete your request.