is_writable

(PHP 4, PHP 5)

is_writable — Tells whether the filename is writable

Beskrivelse

bool is_writable ( string $filename )

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.

Parameterliste

filename: The filename being checked.

Returneringsværdier

Returns TRUE if the filename exists and is writable.

Eksempler

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';
}
?>

Notes

Note: Resultatet af denne funktion er cached. Se clearstatcache() for flere detaljer.

Tip

Fra og med PHP 5.0.0 kan denne funktion også bruges med nogle URL wrappers. Se List of Supported Protocols/Wrappers for en liste over hvilke wrappers understøtter stat() familiens funktionalitet.

Se også