PHP program to sort an integer array in ascending order

<?php
//declaring & initializing array of integers
$array = array(10, 80, 100, 11, 22, 21, 19, 10, 88, 89);

//sorting array in ascending order
sort ($array);

//printing array elements after sorting              
foreach( $array as $num ){
    echo $num."\n";
}
?>

Output
10
10
11
19
21
22
80
88
89
100