empty()

gistfile1.aw

<?php

$var = array();

if (!empty($var)) {
  // This is wrong?
}

if ($var) {
  // This is better?
  // Sure, you get an error if it is undefined, but the $var could still be anything that equates to true, which is almost anything.
}

// In either case you still don't know that it is an array.