(PHP 5 >= 5.1.0)
posix_access — Determine accessibility of a file
$file
[, int $mode = POSIX_F_OK
] )posix_access() checks the user's permission of a file.
fileThe 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.
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.
Restituisce TRUE in caso di successo, FALSE in caso di fallimento.
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!';
} else {
$error = posix_get_last_error();
echo "Error $error: " . posix_strerror($error);
}
?>
Nota: Quando safe-mode è abilitato, PHP controlla che i file o le directory sulle quali si sta andando a lavorare, abbiano lo stesso UID dello script che è in esecuzione.