PHP Manual
Semaphore 函数
Check whether a specific entry exists

shm_has_var

(PHP 5 >= 5.3.0, PHP 7)

shm_has_var — Check whether a specific entry exists

说明

shm_has_var ( resource $shm_identifier , int $variable_key ) : bool

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

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