Added data_types.php file#36

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SubasiniR wants to merge 5 commits intoCodeLouisville:masterfrom

SubasiniR:master

Commits on May 25, 2016

Commits on May 26, 2016

Corrected the null function
SubasiniR
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Commits on Jun 1, 2016

Update data_types.php
SubasiniR
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