(PHP 4, PHP 5)
is_writable — Tells whether the filename is writable
Returns TRUE if the filename exists and is writable. The filename argument may be a directory name allowing you to check if a directory is writable.
Keep in mind that PHP may be accessing the file as the user id that the web server runs as (often 'nobody'). Safe mode limitations are not taken into account.
The filename being checked.
Returns TRUE if the filename exists and is writable.
Example#1 is_writable() example
<?php
$filename = 'test.txt';
if (is_writable($filename)) {
echo 'The file is writable';
} else {
echo 'The file is not writable';
}
?>
Note: Tämän funktion tulokset tallennetaan välimuistiin. Katso tarkemmat tiedot clearstatcache() sivulta.
PHP 5.0.0 versiosta lähtien tämä funktio tukee myös joitakin URL tyyppejä. Katso myös List of Supported Protocols/Wrappers.