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<?php class AliasPool { protected static $i = 0; public static function get () { $alias = 'tag_'; $j = self::$i; do { $alias .= chr(($j % 26) + ord('a')); $j = floor($j / 26); } while ($j > 26); self::$i++; return $alias; } } for ($i = 0; $i < 60; ++$i) { var_dump(AliasPool::get()); print "\n"; }

preferences:
42.27 ms | 402 KiB | 5 Q