Number System OF PHP

<?php

$n = 12;
$o = 017;
$h = 0x1B;

printf("The number is %d and %d and %d", $n, $o, $h);

echo "<br/>";

printf("The binary equivalent of %d is %b",12,12);

echo "<br/>";

printf("The hexadeciman equivalent of %d is %x",1212,1212);

echo "<br/>";

printf("The octal equivalent of %d is %o",1212,1212);

echo "<br/>";

printf("octal %o = %d",0200000,0200000);