posix_access() checks the user's permission of a file.
Note: When safe mode is enabled, PHP checks whether
the files or directories you are about to operate on have the same UID (owner) as the
script that is being executed.
Parameters
file
The name of the file to be tested.
mode
A mask consisting of one or more of POSIX_F_OK,
POSIX_R_OK, POSIX_W_OK and
POSIX_X_OK. Defaults to
POSIX_F_OK.
POSIX_R_OK, POSIX_W_OK and
POSIX_X_OK request checking whether the file
exists and has read, write and execute permissions, respectively.
POSIX_F_OK just requests checking for the
existence of the file.
Return Values
Returns TRUE on success or FALSE on failure.
Examples
Example 1. posix_access() example
This example will check if the $file is readable and writable, otherwise
will print an error message.
<?php
$file = 'some_file';
if (posix_access($file, POSIX_R_OK | POSIX_W_OK)) { echo 'The file is readable and writable!';
