PHP is_writable() Function

Check whether the specified filename is writable:

<?php
$file = "test.txt";
if(is_writable($file)) {
echo ("$file is writable");
} else {
echo ("$file is not writable");
}
?>

The output of the code above could be:

test.txt is writable

Definition and Usage

The is_writable() function checks whether the specified filename is writable.

Note: The result of this function is cached. Use clearstatcache() to clear the cache.

is_writable( file)

Parameter	Description
file	Required. Specifies the path to the file to check

Return Value:	TRUE if the file is writable, an E_WARNING on failure
PHP Version:	4.0+