is_writable
(PHP 4, PHP 5, PHP 7, PHP 8)
is_writable — Tells whether the filename is writable
Description
$filename): bool
Returns true if the filename exists and is
writable. The filename argument may be a directory name allowing you
to check if a directory is writable.
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.
Parameters
-
filename -
The filename being checked.
Return Values
Returns true if the filename exists and is
writable.
Errors/Exceptions
Upon failure, an E_WARNING is emitted.
Examples
Example #1 is_writable() example
<?php
$filename = 'test.txt';
if (is_writable($filename)) {
echo 'The file is writable';
} else {
echo 'The file is not writable';
}
?>
Notes
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.
See Also
- is_readable() - Tells whether a file exists and is readable
- file_exists() - Checks whether a file or directory exists
- fwrite() - Binary-safe file write
