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is_readable
Tells whether the filename is readable
(PHP 4, PHP 5)
bool is_readable ( string filename )
Return Values
Returns TRUE if the file or directory specified by
filename exists and is readable, FALSE otherwise.
Examples
Example 656. 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:
The results of this function are cached. See clearstatcache() for more details.
Tip:
As of PHP 5.0.0 this function can also be used with some URL wrappers. Refer to Appendix O, List of Supported Protocols/Wrappers for a listing of which wrappers support stat() family of functionality.
Note:
The check is done using the real UID/GID instead of the effective one.