PHP umask() Function Usage and Example

PHP Filesystem Reference Manual

The umask() function sets PHP's umask to mask & 0777 And returns the original umask. When PHP is used as a server module, the umask is restored after each request.

Syntax

int umask ([ int $mask ] )

This function can set PHP's umask to mask & 0777And returns the original umask. When PHP is used as a server module, the umask is restored after each request.

　Calling umask() without parameters returns the current umask, and with parameters it returns the original umask.

Online Example

<?php
　　　$old = umask(0);
　　　chmod("PhpProject"/php/sample.txt", 0755);
　　　umask($old);
　　　//Check
　　　if($old != umask()) {
　　　　　　echo "Error changing back umask";
　　　}
?>

PHP Filesystem Reference Manual