admidio
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Improve input filters
replace strValidCharacters() with
https://php.net/manual/de/book.filter.php
http://www.phparch.com/2010/07/never-use-_get-again/
filter_input is a really nice way to filter inputs from $_GET, $_POST, ...
added first tests: https://github.com/Admidio/admidio/blob/master/adm_program/system/string.php#L219-L228
some improvements where made in v3.1