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Synchro / gist:1139429
Created August 11, 2011 11:29
PHP Base-62 encoder/decoder
<?php
/**
* This is an example of a practical encoder and decoder for base-62 data in PHP
* It differs from the majority of examples in that it's fast enough for moderate data sizes, unlike multiprecision converters
* To be practical, base-62 encoding needs to use internal chunking and padding because base-62 does not fit exactly into any integral number of bits
* This means the output is not quite compatible with multiprecision conversions,
* but the encoded data retains all the desirable properties of base-62, so (unlike any base-64 encoding) it's URL, DNS, email address and pathname safe
* @author Marcus Bointon <marcus@synchromedia.co.uk>
* @copyright 2011 Marcus Bointon
* @license http://www.opensource.org/licenses/mit-license.html MIT License