POSIX
PHP Manual

posix_access

(PHP 5 >= 5.1.0)

posix_access — Determine accessibility of a file

Beskrivelse

bool posix_access ( string $file [, int $mode ] )

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

Parameterliste

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.

Returneringsværdier

Returnerer TRUE ved succes, FALSE ved fejl.

Eksempler

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($filePOSIX_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: Når safe mode er aktiveret, checker PHP om filerne eller bibliotekerne som du er ved at benytte, har det samme UID (owner) som scriptet der bliver eksekveret.

Se også


POSIX
PHP Manual