PHP implementation of Yang Hui triangle example

Example, Yang Hui triangle code implemented in PHP.

error_reporting(0);
// $iLine=5;
//Function to output Yang Hui triangle
function YangHui( $iLine)
{
 for ($i = 0;$i <= $iLine;$i++)//line
 {
 for ($j = 0;$j <= $i;$j++)// Column
 {
 if ($i == $j)//row = column (that is, the last column) or the first row and the first column
 {
 $a[$i][$j] = 1;
 echo $a[$i][$j]."";
 }
 else if ($i != 0 && $j == 0)//row=column (that is, the last column) or the first Row and first column
 {
 $a[$i][$j] = 1;
 echo $a[$i][$j]." ";
 }

 else
 {
 $a[ $i][$j] = $a[$i-1][$j]+$a[$i-1][$j-1];//The value of the row + column = the two values ​​​​of the previous row are the same Add
 echo $a[$i][$j]." ";
 }
 }
 }
 // return $a;
}
//Call example, print Yang Hui triangle
YangHui(5);
?>