Php Program for Frequencies of even and odd numbers in a matrix

Given a matrix of order m*n then the task is to find the frequency of even and odd numbers in matrix 
Examples: 

Input : m = 3, n = 3
        { 1, 2, 3 }, 
        { 4, 5, 6 }, 
        { 7, 8, 9 }
Output : Frequency of odd number =  5 
         Frequency of even number = 4


Input :   m = 3, n = 3
         { 10, 11, 12 },
         { 13, 14, 15 },
         { 16, 17, 18 }
Output : Frequency of odd number  =  4 
         Frequency of even number  = 5

PHP

<?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,"
";
    echo " Frequency of even number = "
                               , $even;
}

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

// This code is contributed by anuj_67.
?>

Output: 

 Frequency of odd number = 5  
 Frequency of even number = 4

Time Complexity: O(m*n)

Auxiliary Space: O(1)

Please refer complete article on Frequencies of even and odd numbers in a matrix for more details!