is_readable

(PHP 4, PHP 5)

is_readable — Tells whether the filename is readable

Beskrivelse

bool is_readable ( string $filename )

Tells whether the filename is readable.

Parameterliste

filename: Path to the file.

Returneringsværdier

Returns TRUE if the file or directory specified by filename exists and is readable, FALSE otherwise.

Eksempler

Example#1 is_readable() example


<?php
$filename = 'test.txt';
if (is_readable($filename)) {
    echo 'The file is readable';
} else {
    echo 'The file is not readable';
}
?>

Notes

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 before PHP 5.1.5.

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.

Note: The check is done using the real UID/GID instead of the effective one.

Se også