Online PHP editor | rfc for ZCEu2

@ 2015-01-13T11:27:49Z

<?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' => '2013-12-31'),
    array('start' => '2014-01-01', 'end' => '2014-01-01')
);

echo getOverlapDays($ranges);

Output for git.master, git.master_jit, rfc.property-hooks: 0

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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