<?php

    /**
     * @Construct a Triangle of Pascal
     * @since 2011-09-16
     * @author Edson Chimello
     * @site: http://www.w3tools.info/2011/10/pascal-php-class.html
     *
     * FREE TO USE
     */
    class Pascal
    {
        /**
         *
         * @param $lin
         * @return triangle
         */
        public function getTriangle($lin)
        {
            $cols = $lin * 2 - 1;

            if ($cols < 0)
            {
                $cols = 0;
            }

            for ($i = 0; $i < $lin; $i++)
            {
                for ($j = 0; $j < $cols; $j++)
                {
                    $pascal[$i][$j] = 0;
                    $pascal[0][$lin - 1] = 1;
                    $cont = 0;

                    for ($i = 1; $i < $lin; $i++)
                    {
                        for ($j = $lin - 1 - $i; $j < $cols; $j += 2)
                        {
                            if ($cont <= $i)
                            {
                                if ($j == 0 || $j == $cols - 1)
                                {
                                    $pascal[$i][$j] = 1;

                                }else{
                                    $pascal[$i][$j] = $pascal[$i - 1][$j - 1] +
                                    $pascal[$i - 1][$j + 1];
                                }
                            }
                            $cont++;
                        }
                    $cont = 0;
                    }
                }
            }

            for ($i = 0; $i < $lin; $i++)
            {
                for ($j = 0; $j < $cols; $j++)
                {
                    if ($pascal[$i][$j] != 0)
                    echo sprintf("%4s",$pascal[$i][$j]) . '  ';
                }
                echo "<br />";
            }
        }
    }
?>