PHP Program to Sort the matrix row-wise and column-wise

<?php
// PHP implementation to sort 
// the matrix row-wise and 
// column-wise
$MAX_SIZE = 10;

// function to sort each
// row of the matrix
function sortByRow(&$mat, $n)
{
    for ($i = 0; $i < $n; $i++)

        // sorting row number 'i'
        sort($mat[$i]);
}

// function to find
// transpose of the matrix
function transpose(&$mat, $n)
{
    for ($i = 0; $i < $n; $i++)
    {
        for ($j = $i + 1; 
             $j < $n; $j++) 
        {
            // swapping element at index (i, j) 
            // by element at index (j, i)
            $t = $mat[$i][$j];
            $mat[$i][$j] = $mat[$j][$i];
            $mat[$j][$i] = $t;
        }
    }
}

// function to sort 
// the matrix row-wise
// and column-wise
function sortMatRowAndColWise(&$mat, $n)
{
    // sort rows of mat[][]
    sortByRow($mat, $n);

    // get transpose of mat[][]
    transpose($mat, $n);

    // again sort rows of mat[][]
    sortByRow($mat, $n);

    // again get transpose of mat[][]
    transpose($mat, $n);
}

// function to print the matrix
function printMat(&$mat, $n)
{
    for ($i = 0; $i < $n; $i++) 
    {
        for ($j = 0; $j < $n; $j++)
            echo $mat[$i][$j] . " ";
        echo "
";
    }
}

// Driver Code
$mat = array(array( 4, 1, 3 ),
             array( 9, 6, 8 ),
             array( 5, 2, 7 ));
$n = 3;

echo "Original Matrix:
";
printMat($mat, $n);

sortMatRowAndColWise($mat, $n);

echo "
Matrix After Sorting:
";
printMat($mat, $n);

// This code is contributed 
// by ChitraNayal
?>