Online PHP editor | output for S1rht

<?php $chars = array( 0 => '0', 1 => '1', 2 => '2', 3 => '3', 4 => '4', 5 => '5', 6 => '6', 7 => '7', 8 => '8', 9 => '9', 10 => 'A', 11 => 'B', 12 => 'C', 13 => 'D', 14 => 'E', 15 => 'F', 16 => 'G', 17 => 'H', 18 => 'I', 19 => 'J', 20 => 'K', 21 => 'L', 22 => 'M', 23 => 'N', 24 => 'O', 25 => 'P', 26 => 'Q', 27 => 'R', 28 => 'S', 29 => 'T', 30 => 'U', 31 => 'V', 32 => 'W', 33 => 'X', 34 => 'Y', 35 => 'Z', 36 => 'a', 37 => 'b', 38 => 'c', 39 => 'd', 40 => 'e', 41 => 'f', 42 => 'g', 43 => 'h', 44 => 'i', 45 => 'j', 46 => 'k', 47 => 'l', 48 => 'm', 49 => 'n', 50 => 'o', 51 => 'p', 52 => 'q', 53 => 'r', 54 => 's', 55 => 't', 56 => 'u', 57 => 'v', 58 => 'w', 59 => 'x', 60 => 'y', 61 => 'z', ); $value = 13000000; $link = array(); $rem = 0; $i = 0; do { $i++; $rem = $value % 62; $value = ($value - $rem) / 62; $link[$i] = $rem; } while($value > 0); $value = ''; $count = count($link); for ($i = 0; $i < $count; $i++) $value = $value . $chars[$link[$count - $i]]; for ($i = 0; $i < 4 - $count; $i++) $value = 0 . $value; echo $value;