flock

PHP 4, PHP 5, PHP 7, PHP 8
flock - Portable advisory file locking
Manual
Code Examples

Example #1 flock example

<?php
$fp = fopen("/tmp/lock.txt", "r+");
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PHP Version:

Example #2 flock using the <span class='function-constant'>LOCK_NB</span> option

<?php
$fp = fopen('/tmp/lock.txt', 'r+');
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PHP Version: