is_readable
(PHP 4, PHP 5)
is_readable — Tells whether a file exists and is readable
Description
Tells whether a file exists and 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';
}
?>
Errors/Exceptions
Upon failure, an E_WARNING is emitted.
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: 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.
See Also
- is_writable() - Tells whether the filename is writable
- file_exists() - Checks whether a file or directory exists
- fgets() - Gets line from file pointer