Agora em PHP, ordenando array com o método Bubble Sort

<?php
function BubbleSort( $items ) {

$temp = "";
$size = count( $items );
for( $i = 1; $i < $size; $i++ ) {

for( $j = 1; $j < $size - $i; $j++ ) {

if( $items[$j+1] < $items[$j] ) {

$temp = $items[$j];
$items[$j] = $items[$j+1];
$items[$j+1] = $temp;

}

}

}

}

$items = array(31, 41, 59, 26, 41, 58);
BubbleSort( $items );
?>