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<?php function countDaysByName($dayName, \DateTime $start, \DateTime $end) { $count = 0; $interval = new \DateInterval('P1D'); $period = new \DatePeriod($start, $interval, $end); foreach($period as $day){ if($day->format('D') === ucfirst(substr($dayName, 0, 3))){ $count ++; } } return $count; } echo countDaysByName('wednesday', new \DateTime(2016-01-18), new \DateTime(2016-01-23)); echo var_dump(new \DateTime(2016-18-01));
Output for git.master, git.master_jit, rfc.property-hooks
0object(DateTime)#4 (3) { ["date"]=> string(26) "1997-01-16 13:29:19.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }

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