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# Php Program to Print matrix in snake pattern

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```

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

 `= 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 `

Time complexity: O(n^2) for given n*n matrix

Auxiliary space: O(1)

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

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