shmop_open

( PHP 4 = 4.0.4 )

shmop_open -- Create or open shared memory block

Description

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

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

shmop_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.

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



Ejemplo 1 . Create a new shared memory block

 
?php

 
$shm_id

 
=

 
shmop_open(

 
0x0fff

 
,

 
"c"

 
,

 
0644

 
,

 
100)

 
;

 
?





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