Miscellaneous
|
|
|
|
<?php
# PHP implementation of AOLServer's shared memory!
# Author: Jeremy Collins
$ShareKey = 33241; // Our *HOPEFULLY* unique key...
$ShareVar = 1324; // Our *HOPEFULLY* unique key for the variable...
$ShareSize = 1024 * 1024; // 1MB shared memory to start with...
// We'll dynamically allocate more if needed...
function ns_share($VariableName)
{
global $$VariableName;
global $ShareKey, $ShareSize, $ShareVar;
# Get and lock a semaphore.
$sem = sem_get($ShareKey);
sem_acquire($sem);
# Attach to our existing shared memory segment.
$shm = shm_attach($ShareKey, $ShareSize);
$InitArray = shm_get_var($shm, $ShareVar);
$InitArray[$VariableName] = $$VariableName;
shm_put_var($shm, $ShareVar, $InitArray);
shm_detach($shm);
}
function ns_share_init()
{
global $ShareKey, $ShareSize, $ShareVar;
# Create a new empty shared memory segment, or
# globalize the existing variables.
if(!file_exists("/tmp/.cache.$ShareKey"))
{
# Get and lock the semaphore.
$sem = sem_get($ShareKey);
sem_acquire($sem);
$shm = shm_attach($ShareKey, $ShareSize);
$InitArray["_INTERNAL_EMPTY_"] = "";
shm_put_var($shm, $ShareVar, $InitArray);
shm_detach($shm);
sem_release($sem);
touch("/tmp/.cache.$ShareKey");
}
else
{
# Get and lock a semaphore.
$sem = sem_get($ShareKey);
sem_acquire($sem);
# Attach to our existing shared memory segment.
$shm = shm_attach($ShareKey);
$InitArray = shm_get_var($shm, $ShareVar);
while(list($key, $value) = each($InitArray))
$GLOBALS[$key] = $value;
shm_detach($shm);
}
}
ns_share_init();
?>
|
|
|
Usage Example
|
Run the following code in a separate file.
<?php
include("ns_share.php");
$MyTest = "Hello out there!";
ns_share("MyTest");
$NewTest = "Another test";
ns_share("NewTest");
print "Inserted vars into memory.";
?>
Then run this code in another file. Notice how you are able to access the variables stored from the other page!
<?php
include("ns_share.php");
function test()
{
global $MyTest;
print "Retrieving a variable from shared memory: $MyTest";
}
test();
?>
|
|
|
Rate This Script
|
|
|
|
Store
Your email: