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run code in 150+ php & hhvm versions
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<?php function weeks_in_month($month, $year) { $startDate = new DateTime(); $startDate->setDate($year, $month, 1); $loopDate = $startDate; $week = 1; for($i = $startDate->format('d'); $i <= cal_days_in_month(CAL_GREGORIAN, $month, $year); $i++) { if($loopDate->format('w') % 7 == 0) { $week++; } $loopDate->modify('+1 day'); } return $week; } echo '<p>Jan '.weeks_in_month(1, 2014).'</p>'; echo '<p>Feb '.weeks_in_month(2, 2014).'</p>'; echo '<p>Mar '.weeks_in_month(3, 2014).'</p>'; echo '<p>Apr '.weeks_in_month(4, 2014).'</p>'; echo '<p>May '.weeks_in_month(5, 2014).'</p>'; echo '<p>Jun '.weeks_in_month(6, 2014).'</p>'; echo '<p>Jul '.weeks_in_month(7, 2014).'</p>'; echo '<p>Aug '.weeks_in_month(8, 2014).'</p>'; echo '<p>Sep '.weeks_in_month(9, 2014).'</p>'; echo '<p>Oct '.weeks_in_month(10, 2014).'</p>'; echo '<p>Nov '.weeks_in_month(11, 2014).'</p>'; echo '<p>Dec '.weeks_in_month(12, 2014).'</p>';
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
<p>Jan 5</p><p>Feb 5</p><p>Mar 6</p><p>Apr 5</p><p>May 5</p><p>Jun 6</p><p>Jul 5</p><p>Aug 6</p><p>Sep 5</p><p>Oct 5</p><p>Nov 6</p><p>Dec 5</p>
Output for hhvm-3.10.0 - 3.12.0
Fatal error: Call to undefined function cal_days_in_month() in /in/9Jjp7 on line 9
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/9Jjp7 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: datetime in /in/9Jjp7 on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: datetime in /in/9Jjp7 on line 4