Description
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 writeable.
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.
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';
}
?>
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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 M for a listing of which wrappers support
stat() family of functionality.
See also is_readable(),
file_exists(), and
fwrite().
