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Php Program to Print matrix in snake pattern

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  • Last Updated : 11 Jan, 2022

Given an n x n matrix .In the given matrix, you have to print the elements of the matrix in the snake pattern.

Examples : 

Input :mat[][] = { {10, 20, 30, 40},
                   {15, 25, 35, 45},
                   {27, 29, 37, 48},
                   {32, 33, 39, 50}};
              
Output : 10 20 30 40 45 35 25 15 27 29
         37 48 50 39 33 32 

Input :mat[][] = { {1, 2, 3},
                   {4, 5, 6},
                   {7, 8, 9}};
Output : 1 2 3 6 5 4 7 8 9

 

Matrix printing

We traverse all rows. For every row, we check if it is even or odd. If even, we print from left to right else print from right to left. 

PHP




<?php
// PHP program to print 
// matrix in snake order
$M= 4;
$N =4;
  
function printLN($mat)
{
    global $M;
    global $N;
      
    // Traverse through all rows
    for ($i = 0; $i < $M; $i++) 
    {
  
        // If current row is even, 
        // print from left to right
        if ($i % 2 == 0) 
        {
            for ($j = 0; $j < $N; $j++)
                echo $mat[$i][$j], " ";
  
        // If current row is odd, 
        // print from right to left
        
        else 
        {
            for ($j = $N - 1; $j >= 0; $j--)
                echo $mat[$i][$j] , " ";
        }
    }
}
  
// Driver code
$mat = array(array(10, 20, 30, 40),
             array(15, 25, 35, 45),
             array(27, 29, 37, 48),
             array(32, 33, 39, 50));
  
printLN($mat);
  
// This code is contributed by ajit 
?>

Output : 

10 20 30 40 45 35 25 15 27 29 37 48 50 39 33 32 

Please refer complete article on Print matrix in snake pattern for more details!


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