unique.php

<?php

$array = array(1,2,3,2,4,5,4);
sort($array);
$new_array = array();
$duplicate = -1;
$x = 0;
for ($x = 0; $x < count($array)-1; $x++) {
	if ($array[$x] != $array[$x+1] && $array[$x] != $duplicate) {
		array_push($new_array,$array[$x]);
	} else {
		$duplicate = $array[$x];
	}
}

if($array[$x] != $array[$x-1])
	array_push($new_array,$array[$x]);

print_r($new_array);
	
?>