1 TODO: Make a better readme :)
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6 give examples: lc.sg, ozh.in
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16 explain config.php var
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21 PHP 4.3 should be enough (untested)
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23 PHP BCCOMP extension for handling large integers (used to convert integers to keywords) http://www.php.net/bccomp
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29 - max length of custom keyword: 12 chars
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30 (makes 'zzzzzzzzzzzz' the longest available)
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31 (That makes 4,738,381,338,321,617,846 available URLs by the way)
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33 - difference between base 36 and base 62 encoding
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