posix_access
(PHP 5 >= 5.1.0)
posix_access — Determine accessibility of a file
Beskrivelse
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
$file = 'some_file';
if (posix_access($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: NÃ¥r 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.