PHP Yang Hui triangle simple example

Example, according to Yang Hui's triangle "each number is equal to the sum of the left and right numbers in the previous row".

//Error message
error_reporting(e_all & ~e_deprecated & ~e_notice);

//Print Yang Hui triangle function
function yanghui($iline)
{
 $a = array();
 $nb = '';
 for ($i = 0;$i <= $iline;$i++)//line
 {
 for ($j = 0;$j < ;= $i;$j++)//Column
 {
 if ($i == $j || $j == 0)//Row = column (that is, the last column) or the first row and the first column
 {
 $a[$i][$j] = 1;
 }
 else
 {
 $a[$i][$j] = $a[$i-1][$j]+$a[$ i-1][$j-1];//The value of the row + column = the addition of the two values ​​​​of the previous row
 }
 } // bbs.it-home.org
 }
 return $a;
} < /p>
//Print Yang Hui triangle
$adata = yanghui(4);
echo ''; </li>
<li>print_r($adata); </li>
<li>echo '';
? >