PHP Manual: Synchronization

Description

public mixed Threaded::synchronized(Closure $block, mixed ...$args)

Executes the block while retaining the referenced objects synchronization lock for the calling context

Parameters

block: The block of code to execute
args: Variable length list of arguments to use as function arguments to the block

Return Values

The return value from the block

Examples

Example #1 Synchronizing

<?php
class My extends Thread {
    public function run() {
        $this->synchronized(function($thread){
            if (!$thread->done)
                $thread->wait();
        }, $this);
    }
}
$my = new My();
$my->start();
$my->synchronized(function($thread){
    $thread->done = true;
    $thread->notify();
}, $my);
var_dump($my->join());
?>

The above example will output:

bool(true)