Online PHP editor | rfc for fKK50

<?php echo alphaID('B3333V', true, 6, '3gmgkvj0jw8hrkcnu'); function alphaID($in, $to_num = false, $pad_up = false, $pass_key = null) { $out = ''; $index = 'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'; $base = strlen($index); if ($pass_key !== null) { // Although this function's purpose is to just make the // ID short - and not so much secure, // with this patch by Simon Franz (http://blog.snaky.org/) // you can optionally supply a password to make it harder // to calculate the corresponding numeric ID $i = str_split($index); $pass_hash = hash('sha256',$pass_key); $pass_hash = (strlen($pass_hash) < strlen($index) ? hash('sha512', $pass_key) : $pass_hash); $pass_hash = substr($pass_hash, 0, strlen($index)); $p = str_split($pass_hash); array_multisort($p, SORT_DESC, $i); $index = implode($i); } if ($to_num) { // Digital number <<-- alphabet letter code $len = strlen($in) - 1; for ($t = $len; $t >= 0; $t--) { $bcp = bcpow($base, $len - $t); $out = $out + strpos($index, substr($in, $t, 1)) * $bcp; } if (is_numeric($pad_up)) { $pad_up--; if ($pad_up > 0) { $out -= pow($base, $pad_up); } } } else { // Digital number -->> alphabet letter code if (is_numeric($pad_up)) { $pad_up--; if ($pad_up > 0) { $in += pow($base, $pad_up); } } for ($t = ($in != 0 ? floor(log($in, $base)) : 0); $t >= 0; $t--) { $bcp = bcpow($base, $t); $a = floor($in / $bcp) % $base; $out = $out . substr($index, $a, 1); $in = $in - ($a * $bcp); } } return $out; }

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