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<?php function getOverlapDays($ranges) { $overlapDays = 0; // no overlap by default $range = $ranges[0]; // starting with the first element of range array $itemsCnt = count($ranges); for ($id = 1; $id < $itemsCnt; $id++) { $start1 = is_a($range["start"], "DateTime") ? $range["start"] : new DateTime($range["start"]); $end1 = is_a($range["end"], "DateTime") ? $range["end"] : new DateTime($range["end"]); $start2 = is_a($ranges[$id]["start"], "DateTime") ? $ranges[$id]["start"] : new DateTime($ranges[$id]["start"]); $end2 = is_a($ranges[$id]["end"], "DateTime") ? $ranges[$id]["end"] : new DateTime($ranges[$id]["end"]); if ($start1 <= $end2 && $end1 >= $start2) { // if the dates overlap return min($end1, $end2)->diff(max($start2, $start1))->days + 1; // return how many days overlap } else { $range = [ "start" => $start1 > $start2 ? $start1 : $start2, "end" => $end1 > $end2 ? $end1 : $end2 ]; } } return $overlapDays; } // example $ranges = array( array('start' => '2013-12-31', 'end' => '2014-01-01'), array('start' => '2014-01-01', 'end' => '2014-01-31') ); echo getOverlapDays($ranges);
based on ZCEu2
Output for 5.4.0 - 7.2.0
1
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/Aifer on line 17
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/Aifer on line 17
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /in/Aifer on line 15
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_OBJECT_OPERATOR in /in/Aifer on line 15
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Aifer on line 15
Process exited with code 255.