shm_has_var()

(PHP 5 >= 5.3.0, PHP 7)

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