shm_open

(unknown)

shm_open -- Create or open shared memory block

Description

int shm_open (int key, string flags, int mode, int size)

shm_open() can create or open a shared memory block.

shm_open() takes 4 parameters: key, which is the system's id for the shared memory block, this parameter can be passed as a decimal or hex. The second parameter are the flags that you can use:

The third parameter is the mode, which are the permissions that you wish to assign to your memory segment, those are the same as permission for a file. Permissions need to be passed in octal form ex. 0644. The last parameter is size of the shared memory block you wish to create in bytes.

Note: Note: the 3rd and 4th should be entered as 0 if you are opening an existing memory segment. On success shm_open() will return an id that you can use to access the shared memory segment you've created.

Example 1. Create a new shared memory block


<?php
$shm_id = shm_open(0x0fff, "c", 0644, 100);
?>
      

This example opened a shared memory block with a system id of 0x0fff.