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>shmop_open</H1
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><P
> (PHP 4 >= 4.0.4)</P
>shmop_open -- Create or open shared memory block</DIV
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><H2
>Description</H2
>int <B
CLASS="methodname"
>shmop_open</B
> ( int key, string flags, int mode, int size)<BR
></BR
><P
> <B
CLASS="function"
>shmop_open()</B
> can create or open a shared memory block.
</P
><P
> <B
CLASS="function"
>shmop_open()</B
> 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:
<P
></P
><UL
><LI
><P
> "a" for access (sets IPC_EXCL)
use this flag when you need to open an existing shared memory segment
</P
></LI
><LI
><P
> "c" for create (sets IPC_CREATE)
use this flag when you need to create a new shared memory segment.
</P
></LI
></UL
>
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.
<DIV
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><BLOCKQUOTE
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><P
><B
>Nota: </B
>
Note: the 3rd and 4th should be entered as 0 if you are opening an
existing memory segment. On success <B
CLASS="function"
>shmop_open()</B
> will
return an id that you can use to access the shared memory segment
you've created.
</P
></BLOCKQUOTE
></DIV
>
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><B
>Ejemplo 1. Create a new shared memory block</B
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><PRE
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><?php
$shm_id = shmop_open(0x0fff, "c", 0644, 100);
?></PRE
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>
</P
><P
> This example opened a shared memory block with a system id of 0x0fff.
</P
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