Php/docs/function.is-writable
is_writable
(PHP 4, PHP 5, PHP 7)
is_writable — Tells whether the filename is writable
Description
is_writable
( string $filename
) : bool
Returns TRUE
if the filename
exists and is
writable. The filename argument may be a directory name allowing you
to check if a directory is writable.
Keep in mind that PHP may be accessing the file as the user id that the web server runs as (often 'nobody'). Safe mode limitations are not taken into account.
Parameters
filename
- The filename being checked.
Return Values
Returns TRUE
if the filename
exists and is
writable.
Examples
Example #1 is_writable() example
<?php$filename = 'test.txt';if (is_writable($filename)) { echo 'The file is writable';} else { echo 'The file is not writable';}?>
Errors/Exceptions
Upon failure, an E_WARNING
is emitted.
Notes
Note:
The results of thisfunction 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 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