Php/docs/function.shm-has-var

• 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 ( SysvSharedMemory $shm , int $key ) : bool

Checks whether a specific key exists inside a shared memory segment.

参数

shm

A shared memory segment obtained from shm_attach().

key

The variable key.

返回值

Returns true if the entry exists, otherwise false

更新日志

版本	说明
8.0.0	shm expects a SysvSharedMemory instance now; previously, a resource was expected.

参见

• shm_get_var() - Returns a variable from shared memory
• shm_put_var() - Inserts or updates a variable in shared memory