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    <p>Use an int column in your DB as the primary key that auto-increments on insert, then convert this ID from decimal to base-62 in your logic for the permalink (62 allows use of 0-9, a-z and A-Z).</p> <p>When creating a new permalink:</p> <pre><code>&lt;?php /** * Convert decimal int to a base-62 string * * @param int $dec * @returns string */ function toBase62 ($dec) { // 0 is always 0 if ($dec == 0) return "0"; // this array maps decimal keys to our base-62 radix digits $values = array( "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z" ); // convert negative numbers to positive. $neg = $dec &lt; 0; if ($neg) $dec = 0 - $dec; // do the conversion: $chars = array(); // this will store our base-62 chars while ($dec &gt; 0) { $val = $dec % 62; $chars[] = $values[$val]; $dec -= $val; $dec /= 62; } // add zero-padding: while (count($chars) &lt; 6) $chars[] = '0'; // convert to string $rv = implode( '' , array_reverse($chars) ); // if input was negative: return $neg ? "-$rv" : $rv; } // Usage example: // ... do mysql insert here and retrieve new insert_id into var $id ... $permalink = toBase62($id); ?&gt; </code></pre> <p>When decoding a requested permalink:</p> <pre><code>&lt;?php /** * Convert base-62 string to a decimal int * * @param string $str * @returns int on success, FALSE on failure */ function base62ToInt ($str) { // validate str: if ( ! preg_match('/^\-?[0-9A-Za-z]+$/', $str) ) return FALSE; // not a valid string // "0" is always 0 (as is "0000...") if ( preg_match('/^0+$', $str) ) return 0; // this array maps decimal keys to our base-62 radix digits $values = array( "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z" ); // flip $values so it maps base-62 digits to decimal values: $values = array_flip($values); // get chars from $str: $chars = str_split($str); // convert negative numbers to positive. $neg = $chars[0] == '-'; if ($neg) array_shift($chars); // do the conversion: $val = 0; $i = 0; while ( count($chars) &gt; 0 ) { $char = array_pop($chars); $val += ($values[$char] * pow(62, $i) ); ++$i; } return $neg ? 0 - $val : $val; } // Usage example: // ... assuming permalink has been put in a var called $permalink $id = base62ToInt($permalink); // ... now look up $id in DB ?&gt; </code></pre>
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