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posix_access

Determine accessibility of a file (PHP 5 >= 5.1.0)
bool posix_access ( string file [, int mode] )

posix_access() checks the user's permission of a file.

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 1864. 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!';

} else {
   
$error = posix_get_last_error();

   echo
"Error $error: " . posix_strerror($error);
}

?>


Notes

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.