is_readable
(PHP 4, PHP 5)
is_readable — Tells whether the filename is readable
Description
bool is_readable
( string $filename
)
Tells whether the filename is readable.
Parameters
- filename
-
Path to the file.
Return values
Returns TRUE if the file or directory specified by filename exists and is readable, FALSE otherwise.
Examples
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: Tämän funktion tulokset tallennetaan välimuistiin. Katso tarkemmat tiedot clearstatcache() sivulta.
Tip
PHP 5.0.0 versiosta lähtien tämä funktio tukee myös joitakin URL tyyppejä. Katso myös List of Supported Protocols/Wrappers.
Note: The check is done using the real UID/GID instead of the effective one.