Triangle.php

<?php
global $triangularNumberOffset, $divisors;

$triangularNumberOffset = 1;
$triangularNumber = 0;

function nextTriangularNumberOffset()
{
    global $triangularNumberOffset;
    return $triangularNumberOffset++;
}

function nextTriangularNumber($n, &$triangularNumber)
{
    return $triangularNumber += $n;
}

/*for ($i=0; $i<7; $i++) {
    t(nextTriangularNumberOffset(), $triangularNumber);
}*/

set_time_limit(0);
function d($n, $d = 2)
{
    global $divisors;
    $divisors[$n] = array(1, $n);
    while(true){
        if ($n % $d == 0) {
            $divisors[$n][] = $n / $d;
        }
        $d++;

        if($n <= $d){
            break;
        }
    };
    //return $divisors[$n];
    return count($divisors[$n]);
}

function n(){
    global $triangularNumber;
    return nextTriangularNumber(nextTriangularNumberOffset(), $triangularNumber);
}

$number = nextTriangularNumberOffset();
$i = 1;
while(true){
    $n = n();
    echo $n;
    if(d($n) < 20){
        break;
    }
    $number += $i;
    $i++;
}
//echo $n;
//print_r(d(50000000));//4812376