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

相关文章

php apcu 函数 checks if entry exists php cubrid 函数 check whether the instance pointed by oid exists php dba 函数 check whether key exists php enchant 函数 whether a dictionary exists or not. using non empty tag php enchant 函数 check whether a word is correctly spelled or not php enchant 函数 whether or not word exists in this spelling session php gupnp 函数 check whether root device is available php gupnp 函数 check whether subscription is valid to the service php imap 函数 check if the imap stream is still active php intl 函数 check whether the given error code indicates failure php ldap 函数 delete an entry from a directory php ldap 函数 get the dn of a result entry php mcve 函数 whether or not to validate the passed identifier on any transaction it is passed to php semaphore 函数 check whether a message queue exists php semaphore 函数 receive a message from a message queue php phpdbg 函数 inserts a breakpoint at entry to a method php radius 函数 attaches a vendor specific integer attribute php semaphore 函数 check whether a specific entry exists php splobjectstorage checks whether an object exists in the storage php yaf registry check whether an item exists

关注编程学问公众号