Online PHP editor | output 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 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: 0
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 0
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/ZCEu2 on line 17
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected '[' in /in/ZCEu2 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/ZCEu2 on line 15
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_OBJECT_OPERATOR in /in/ZCEu2 on line 15
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/ZCEu2 on line 15
Process exited with code 255.

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