(PHP 4, PHP 5, PHP 7, PHP 8)
is_readable — Tells whether a file exists and is readable
$filename): boolTells whether a file exists and is readable.
filenamePath to the file.
Returns true if the file or directory specified by
filename exists and is readable, false otherwise.
Upon failure, an E_WARNING is emitted.
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';
}
?>
Keep in mind that PHP may be accessing the file as the user id that the web server runs as (often 'nobody').
Note: The results of this function are cached. See clearstatcache() for more details.
As of PHP 5.0.0, this function can also be used with some URL wrappers. Refer to Supported Protocols and Wrappers to determine which wrappers support stat() family of functionality.
Note:
The check is done using the real UID/GID instead of the effective one.
This function may return true for directories. Use
is_dir() to distinguish file and directory.