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run code in 200+ php & hhvm versions
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<?php function datediffInWeeks($date1, $date2) { if($date1 > $date2) return datediffInWeeks($date2, $date1); $first = DateTime::createFromFormat('m/d/Y', $date1); $second = DateTime::createFromFormat('m/d/Y', $date2); return floor($first->diff($second)->days/7); } var_dump(datediffInWeeks('2016/03/12', '2016/03/31'));// 21
based on Hs5sY
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Error: Call to a member function diff() on boolean in /in/G9rvV:7 Stack trace: #0 /in/G9rvV(10): datediffInWeeks('2016/03/12', '2016/03/31') #1 {main} thrown in /in/G9rvV on line 7
Process exited with code 255.
Output for 5.6.8 - 5.6.28
Fatal error: Call to a member function diff() on boolean in /in/G9rvV on line 7
Process exited with code 255.
Output for 5.3.21 - 5.5.35
Fatal error: Call to a member function diff() on a non-object in /in/G9rvV on line 7
Process exited with code 255.