Online PHP editor | output for 1EBLA

@ 2012-09-06T17:02:29Z

<?php
function scholar_parse_date($date)
{
    if (preg_match('/^\s*(?P<year>\d+)(?>-(?P<month>\d{1,2}))?(?>-(?P<day>\d{1,2}))?\s*$/', $date, $match)) {
        $y = intval($match['year']);
        $m = isset($match['month']) ? intval($match['month']) : null;
        $d = isset($match['day']) ? intval($match['day']) : null;

        // Jezeli $m jest nullem, tzn. ze $d tez jest nullem, wiec
        // rok jako liczba calkowita jest poprawny.
        // Jezeli $m nie jest nullem, musi byc z przedzialu 1..12.
        // Jezeli $d jest nullem, nic wiecej nie trzeba sprawdzac,
        // jezeli nie jest, trzeba sprawdzic pelna date.
        $valid = ((null === $m) || (1 <= $m && $m <= 12))
                 && ((null === $d) || checkdate($m, $d, $y));

        if ($valid) {
            return array(
                'year'  => $y,
                'month' => $m,
                'day'   => $d,
                'iso'   => null === $m
                    ? sprintf('%04d', $y)
                    : (null === $d
                        ? sprintf('%04d-%02d', $y, $m)
                        : sprintf('%04d-%02d-%02d', $y, $m, $d)
                    ),
            );
        }
    }

    return false;
}

var_dump(scholar_parse_date('1992'));
var_dump(scholar_parse_date('1992-01'));
var_dump(scholar_parse_date('1992-01-04'));
var_dump(scholar_parse_date('1992-01-32'));

Output for 4.3.3 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 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 - 8.3.6: array(4) { ["year"]=> int(1992) ["month"]=> NULL ["day"]=> NULL ["iso"]=> string(4) "1992" } array(4) { ["year"]=> int(1992) ["month"]=> int(1) ["day"]=> NULL ["iso"]=> string(7) "1992-01" } array(4) { ["year"]=> int(1992) ["month"]=> int(1) ["day"]=> int(4) ["iso"]=> string(10) "1992-01-04" } bool(false)
Output for 4.3.0 - 4.3.2: Notice: Undefined index: year in /in/1EBLA on line 5 array(4) { ["year"]=> int(0) ["month"]=> NULL ["day"]=> NULL ["iso"]=> string(4) "0000" } Notice: Undefined index: year in /in/1EBLA on line 5 array(4) { ["year"]=> int(0) ["month"]=> NULL ["day"]=> NULL ["iso"]=> string(4) "0000" } Notice: Undefined index: year in /in/1EBLA on line 5 array(4) { ["year"]=> int(0) ["month"]=> NULL ["day"]=> NULL ["iso"]=> string(4) "0000" } Notice: Undefined index: year in /in/1EBLA on line 5 array(4) { ["year"]=> int(0) ["month"]=> NULL ["day"]=> NULL ["iso"]=> string(4) "0000" }

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