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1) Regular expression, time related match- from 23rd may 2:00pm, 2013. extract time
2) With having and group by, will having will be place before or after or anywhere will be fine.
3) session database store method
4) primary number prog in php
5) array value without using default php function,
6) array $arr = array ('name' => 'dr', abc, 34); array_rand ($arr), print $arr(0); nothing/24/0/error.
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