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is_writable

Tells whether the filename is writable (PHP 4, PHP 5)
bool is_writable ( string filename )

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 659. 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.

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.