PHP Program for Frequencies of Even and Odd Numbers in a Matrix

<?php
// PHP Program to Find the frequency
// of even and odd numbers in a matrix

$MAX = 100;

// Function for calculating frequency
function freq($ar, $m, $n) {
    $even = 0;
    $odd = 0;

    for ($i = 0; $i < $m; ++$i) {
        for ($j = 0; $j < $n; ++$j) {
          
            // Modulo by 2 to check
            // even and odd
            if ($ar[$i][$j] % 2 == 0) {
                ++$even;
            } else {
                ++$odd;
            }
        }
    }

    // print Frequency of numbers
    echo " Frequency of odd number = " . $odd . "\n";
    echo " Frequency of even number = " . $even;
}

// Driver code
$m = 3;
$n = 3;
$array = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];
freq($array, $m, $n);

?>