get a unique random list of array items in PHP

<?php
/*
* $array = the array to be filtered
* $total = the maximum number of items to return
* $unique = whether or not to remove duplicates before getting a random list
*/
function unique_array($array, $total, $unique = true){
$newArray = array();
if((bool)$unique){
$array = array_unique($array);
}
shuffle($array);
$length = count($array);
for($i = 0; $i < $total; $i++){
if($i < $length){
$newArray[] = $array[$i];
}
}
return $newArray;
}

$phrases = array('Hello Sailor','Acid Test','Bear Garden','Botch A Job','Dark Horse',
'In The Red','Man Up','Pan Out','Quid Pro Quo','Rub It In','Turncoat',
'Yes Man','All Wet','Bag Lady','Bean Feast','Big Wig', 'Big Wig','Bear Garden'
,'All Wet','Quid Pro Quo','Rub It In');

print_r(unique_array($phrases, 1)); // Returns 1 result
print_r(unique_array($phrases, 5)); // Returns 5 unique results
print_r(unique_array($phrases, 5, false)); // Returns 5 results, but may have duplicates if
// there are duplicates in original array
print_r(unique_array($phrases, 100)); // Returns 100 unique results
print_r(unique_array($phrases, 100, false)); // Returns 100 results, but may have duplicates if there are duplicates in original array


?>