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<?php function datediffInWeeks($date1, $date2) { if($date1 > $date2) return datediffInWeeks($date2, $date1); $first = DateTime::createFromFormat('Y-m-d', $date1); $second = DateTime::createFromFormat('Y-m-d', $date2); return floor($first->diff($second)->days/7); } var_dump(datediffInWeeks('2015-2-1', '6/21/2016'));// 21 var_dump(datediffInWeeks('2013-6-1', '1/2/2013'));// 21
based on V8m2T
Output for 7.2.0
Warning: DateTime::diff() expects parameter 1 to be DateTimeInterface, boolean given in /in/tnWQk on line 7 Notice: Trying to get property 'days' of non-object in /in/tnWQk on line 7 float(0) Fatal error: Uncaught Error: Call to a member function diff() on boolean in /in/tnWQk:7 Stack trace: #0 /in/tnWQk(4): datediffInWeeks('1/2/2013', '2013-6-1') #1 /in/tnWQk(11): datediffInWeeks('2013-6-1', '1/2/2013') #2 {main} thrown in /in/tnWQk on line 7
Process exited with code 255.
Output for 7.0.0 - 7.1.10
Warning: DateTime::diff() expects parameter 1 to be DateTimeInterface, boolean given in /in/tnWQk on line 7 Notice: Trying to get property of non-object in /in/tnWQk on line 7 float(0) Fatal error: Uncaught Error: Call to a member function diff() on boolean in /in/tnWQk:7 Stack trace: #0 /in/tnWQk(4): datediffInWeeks('1/2/2013', '2013-6-1') #1 /in/tnWQk(11): datediffInWeeks('2013-6-1', '1/2/2013') #2 {main} thrown in /in/tnWQk on line 7
Process exited with code 255.
Output for 5.6.8 - 5.6.28
Warning: DateTime::diff() expects parameter 1 to be DateTimeInterface, boolean given in /in/tnWQk on line 7 Notice: Trying to get property of non-object in /in/tnWQk on line 7 float(0) Fatal error: Call to a member function diff() on boolean in /in/tnWQk on line 7
Process exited with code 255.
Output for 5.5.24 - 5.5.35
Warning: DateTime::diff() expects parameter 1 to be DateTimeInterface, boolean given in /in/tnWQk on line 7 Notice: Trying to get property of non-object in /in/tnWQk on line 7 float(0) Fatal error: Call to a member function diff() on a non-object in /in/tnWQk on line 7
Process exited with code 255.
Output for 5.3.22 - 5.4.45
Warning: DateTime::diff() expects parameter 1 to be DateTime, boolean given in /in/tnWQk on line 7 Notice: Trying to get property of non-object in /in/tnWQk on line 7 float(0) Fatal error: Call to a member function diff() on a non-object in /in/tnWQk on line 7
Process exited with code 255.