shm_has_var
(PHP 5 >= 5.3.0)
shm_has_var — Check whether a specific entry exists
说明
bool shm_has_var ( resource $shm_identifier , int $variable_key )Checks whether a specific key exists inside a shared memory segment.
参数
- shm_identifier
-
Shared memory segment, obtained from shm_attach().
- variable_key
-
The variable key.
返回值
Returns TRUE if the entry exists, otherwise FALSE
参见
- shm_get_var() - Returns a variable from shared memory
- shm_put_var() - Inserts or updates a variable in shared memory
