is_really_writable()

is_really_writable($file)

is_writable() returns TRUE on Windows servers when you really can’t write to the file as the OS reports to PHP as FALSE only if the read-only attribute is marked.

This function determines if a file is actually writable by attempting to write to it first. Generally only recommended on platforms where this information may be unreliable.

Example:

if (is_really_writable('file.txt'))
{
        echo "I could write to this if I wanted to";
}
else
{
        echo "File is not writable";
}