In PHP, flock is a function, which means locking or releasing a file; the function of this function is to lock the file when operating the file. It is only available when the lock is cancelled. If successful, the function returns true. If it fails, the function returns false, and the syntax is "flock(file,lock,block)".
The operating environment of this article: Windows 10 system, PHP version 8.1, Dell G3 computer
What does flock mean in php
## The #flock() function locks or releases a file. The function of flock in php is to lock the file when operating the file, and it is only available when the lock is unlocked. If successful, this function returns TRUE. On failure, returns FALSE. Syntaxflock(file,lock,block)Parameter Description
- file Required. Specifies an open file to be locked or released.
- lock Required. Specifies which lock type to use. Possible values:
- block Optional. If set to 1, blocks other processes while locking.
<?php $file = fopen("test.txt","w+"); // exclusive lock if (flock($file,LOCK_EX)) { fwrite($file,"Write something"); // release lock flock($file,LOCK_UN); } else { echo "Error locking file!"; } fclose($file); ?>Recommended learning: "
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