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+<?php
+/*
+This software is licensed through a BSD-style License.
+http://www.opensource.org/licenses/bsd-license.php
+
+Copyright (c) 2009 Alexander Sulfrian
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+Neither the name of Jacob D. Cohen nor the names of his contributors
+may be used to endorse or promote products derived from this software
+without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+require_once('IdGeneratorEngine.php');
+
+class ShortGenerator extends IdGeneratorEngine
+{
+ //const $codeset = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
+ //readable character set excluded (0,O,1,l)
+ const codeset = "23456789abcdefghijkmnopqrstuvwxyzABCDEFGHIJKLMNPQRSTUVWXYZ";
+
+ static private function bcFloor($x)
+ {
+ return bcmul($x, '1', 0);
+ }
+
+ public function generateId()
+ {
+ $base = strlen(self::codeset);
+ $converted = '';
+
+ // id source (time + random)
+ $n = intval(time() . rand(1000, getrandmax()));
+
+ while ($n > 0) {
+ $converted = substr(self::codeset, bcmod($n, $base), 1) . $converted;
+ $n = self::bcFloor(bcdiv($n, $base));
+ }
+
+ return $converted;
+ }
+}