is_readable

(PHP 3, PHP 4, PHP 5)

is_readable -- Tells whether the filename is readable

Description

bool is_readable ( string filename )

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

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.

Eksempel 1. is_readable() example

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

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

Vink: Fra og med PHP 5.0.0 kan denne funktion også bruges med nogle URL wrappers. Se Appendiks N for en liste over hvilke wrappers understøtter stat() familiens funktionalitet.

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

See also is_writable(), file_exists(), and fgets().