3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?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 - 7.2.0
string(2) "DD" string(2) "MM" string(2) "YY"