It's a tiny lib made for PHP to use by simplifying memory sharing (cache/buffer/datasets/persistent variable)
(Only compatible with unix systems yet)
Use of shared memory is a fast method of data exchange between processes, mainly because there is no kernel involvement in passing data after the segments are created. Methods of this kind are often called interprocess communication (IPC). Other IPC methods include pipes, message queues, RPC, and sockets.
This fast and reliable ability to exchange data between applications is invaluable when working with an ecosystem of applications needing to communicate with each other. The usual method of using databases to exchange information between applications often causes slow queries and even blocking I/O, depending on the size of the ecosystem. With shared memory, there's no I/O slowing a script execution down.
Just need to add the memalloc.php file with a require in your script :
require_once('lib/memalloc.php');(Obviously you can change his location)
| Funct | Utility |
|---|---|
memalloc_write($stackname, $data) |
Writing/overwriting in shared memory |
memalloc_read($stackname) |
Reading in shared memory |
memalloc_delete($stackname) |
Delete an existing stack in the shared memory |
memalloc_clean() |
If necessary to delete oldest stacks (20% free memory after) |
memalloc_purge() |
If necessary to clear the memory instantly |
<?php
require_once('lib/memalloc.php');
memalloc_write('var1', 'Foobar');
$data = memalloc_read('var1');
$data.= '123';
memalloc_write('var1', $data);
echo memalloc_read('var1');
memalloc_delete('var1');
?>Output will display Foobar123
At the end of this script, var1 stack is destroyed, but if you don't delete it, the next time the script is executed, the stack will still be available.
(As long as the apache2 service isn't restarted obviously)
By default, $memalloc_max_memory is equal to 50Mo
and $memalloc_autoclean is equal to 80%.
When process memory exceeds by default 50Mo, the function memalloc_clean() is called to delete oldest stacks, to reach by default 80% of used memory (20% free).
Have fun!