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<HTML
><HEAD
><TITLE
>Shared Memory Functions</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.57"><LINK
REL="HOME"
TITLE="PHP Manual"
HREF="manual.html"><LINK
REL="UP"
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HREF="funcref.html"><LINK
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TITLE="session_cache_limiter"
HREF="function.session-cache-limiter.html"><LINK
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TITLE="shm_open"
HREF="function.shm_open.html"><META
NAME="HTTP_EQUIV"
CONTENT="text/html; charset=ISO-8859-1"></HEAD
><BODY
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BGCOLOR="#FFFFFF"
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><H1
CLASS="title"
>LXI. Shared Memory Functions</H1
><DIV
CLASS="PARTINTRO"
><A
NAME="AEN34229"
></A
><P
> Shmop is an easy to use set of functions that allows php to read,
write, create and delete UNIX shared memory segments. The functions
will not work on windows, as it does not support shared memory. To
use shmop you will need to compile php with the --enable-shmop parameter
in your configure line.
</P
><P
> <TABLE
WIDTH="100%"
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CLASS="EXAMPLE"
><TR
><TD
><DIV
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><A
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></A
><P
><B
>Example 1. Shared Memory Operations Overview</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
> <?php
// Create 100 byte shared memory block with system id if 0xff3
$shm_id = shm_open(0xff3, "c", 0644, 100);
if(!$shm_id) {
echo "Couldn't create shared memory segment\n";
}
// Get shared memory block's size
$shm_size = shm_size($shm_id);
echo "SHM Block Size: ".$shm_size. " has been created.\n";
// Lets write a test string into shared memory
$shm_bytes_written = shm_write($shm_id, "my shared memory block", 0);
if($shm_bytes_written != strlen("my shared memory block")) {
echo "Couldn't write the entire length of data\n";
}
// Now lets read the string back
$my_string = shm_read($shm_id, 0, $shm_size);
if(!$my_string) {
echo "Couldn't read from shared memory block\n";
}
echo "The data inside shared memory was: ".$my_string."\n";
//Now lets delete the block and close the shared memory segment
if(!shm_delete($shm_id)) {
echo "Couldn't mark shared memory block for deletion.
}
shm_close($shm_id);
?>
</PRE
></TD
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></TABLE
></DIV
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></TABLE
>
</P
></DIV
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
><A
HREF="function.shm_open.html"
>shm_open</A
> — Create or open shared memory block</DT
><DT
><A
HREF="function.shm_read.html"
>shm_read</A
> — Read data from shared memory block</DT
><DT
><A
HREF="function.shm_write.html"
>shm_write</A
> — Write data into shared memory block</DT
><DT
><A
HREF="function.size.html"
>shm_size</A
> — Get size of shared memory block</DT
><DT
><A
HREF="function.shm_delete.html"
>shm_delete</A
> — Delete shared memory block</DT
><DT
><A
HREF="function.shm_close.html"
>shm_close</A
> — Close shared memory block</DT
></DL
></DIV
></DIV
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