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run code in 150+ php & hhvm versions
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<?php foreach(array('day', 'month', 'year') as $dobPart) { $prefix = substr($dobPart,0,1); $prefix = str_repeat($prefix,2); var_dump(strtoupper($prefix)); }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
string(2) "DD" string(2) "MM" string(2) "YY"