Here is a PHP program to display the matrix as follows:

0 0 1 0 1 0 1 0 0

Here in the above matrix, there are three rows and three columns and when row index number+column index number=number of rows-1 then one will be assigned as a value to the array element and otherwise 0 will be assigned to other elements.

## PHP Program to Display The Matrix

<html> <body> <?php echo "<b>The matrix is given below:-</b>"."<br>"; $a=array(array()); $rows=3; $cols=3; for($i=0;$i<$rows;$i=$i+1) { for($j=0;$j<$cols;$j=$j+1) { if($i+$j==$rows-1) { $a[$i][$j]=1; } else { $a[$i][$j]=0; } echo $a[$i][$j]." "; } echo "<br>"; } ?> </body> </html>

### Output:

The matrix is given below:- 0 0 1 0 1 0 1 0 0

Here $i is the row index number and $j is the column index number and if their addition is equal to the number of rows-1(here $rows is the number of rows of the array $a), then 1 will be assigned to array element(here $a[$i][$j] is the array element)and 0 will be assigned to other elements.