Ticket #25768: core-fixes.php

<?php

/**
 * Correct wordpress bug. Replaces date_i18n() function which has some bugs.
 */
add_filter('date_i18n', 'fix_date_i18n', 10, 4);
function fix_date_i18n($dateformated, $dateformatstring, $unixtimestamp = false, $gmt = false)
{
        /* @var $wp_locale WP_Locale */
        global $wp_locale;
        $timestamp = $unixtimestamp;

        // get current timestamp if $unixtimestamp is false
        if (false === $timestamp)
        {
                if ($gmt)
                        $timestamp = time();
                else
                        $timestamp = current_time('timestamp');
        }


        // get components of the date (timestamp) as array
        $datecomponents = getdate($timestamp);

        // numeric representation of a month, with leading zeros
        $datemonth = $wp_locale->get_month($datecomponents['mon']);
        $datemonth_abbrev = $wp_locale->get_month_abbrev($datemonth);
        // numeric representation of the day of the week
        $dateweekday = $wp_locale->get_weekday($datecomponents['wday']);
        $dateweekday_abbrev = $wp_locale->get_weekday_abbrev($dateweekday);
        // get if hour is Ante meridiem or Post meridiem
        $meridiem = $datecomponents['hours'] >= 12 ? 'pm' : 'am';
        // lowercase Ante meridiem and Post meridiem hours
        $datemeridiem = $wp_locale->get_meridiem($meridiem);
        // uppercase Ante meridiem and Post meridiem
        $datemeridiem_capital = $wp_locale->get_meridiem(strtoupper($meridiem));

        // escape literals
        $dateweekday_abbrev = backslashit($dateweekday_abbrev);
        $datemonth = backslashit($datemonth);
        $dateweekday = backslashit($dateweekday);
        $datemonth_abbrev = backslashit($datemonth_abbrev);
        $datemeridiem = backslashit($datemeridiem);
        $datemeridiem_capital = backslashit($datemeridiem_capital);

        // the translated format string
        $translateddateformatstring = '';
        // the 2 arrays map a format literal to its translation (e. g. 'F' to the escaped month translation)
        $tranlateformates = array('D', 'F', 'l', 'M', 'a', 'A', 'c', 'r');
        $translations = array(
                $dateweekday_abbrev, // D
                $datemonth, // F
                $dateweekday, // l
                $datemonth_abbrev, // M
                $datemeridiem, // a
                $datemeridiem_capital, // A
                'Y-m-d\TH:i:sP', // c
                sprintf('%s, d %s Y H:i:s O', $dateweekday_abbrev, $datemonth_abbrev), // r
        );

        // find each format literal that needs translation and replace it by its translation
        // respects the escaping
        // iterate $dateformatstring from ending to beginning
        for ($i = strlen($dateformatstring) - 1; $i > -1; $i--)
        {
                // test if current char is format literal that needs translation
                $tranlateformateindex = array_search($dateformatstring[$i], $tranlateformates);

                if ($tranlateformateindex !== false)
                {
                        // counts the slashes (the escape char) in front of the current char
                        $slashescounter = 0;

                        // count all slashes left-hand side of the current char
                        for ($j = $i - 1; $j > -1; $j--)
                        {
                                if ($dateformatstring[$j] == '\\')
                                        $slashescounter++;
                                else
                                        break;
                        }

                        // number of slashes is even
                        if ($slashescounter % 2 == 0)
                                // current char is not escaped, therefore it is a format literal
                                $translateddateformatstring = $translations[$tranlateformateindex] . $translateddateformatstring;
                        else
                                // current char is escaped, therefore it is not a format literal, just add it unchanged
                                $translateddateformatstring = $dateformatstring[$i] . $translateddateformatstring;
                }
                else
                        // current char is no a format literal, just add it unchanged
                        $translateddateformatstring = $dateformatstring[$i] . $translateddateformatstring;
        }

        $dateformatstring = $translateddateformatstring;

        if ($gmt)
                // get GMT date string
                $dateformated = gmdate($dateformatstring, $timestamp);
        else
        {
                // get Wordpress time zone
                $timezone_string = get_option('timezone_string');

                // TODO: If get_option('timezone_string') is empty we should work with the gmt offset. Not easy to implement.
                /*// get Wordpress gmt offset (in hours)
                $gmtoffset = get_option('gmt_offset');

                // try to get time zone from gmt offset if timezone_string is not given
                if($timezone_string == '' && $gmtoffset !== false)
                {
                        $timezone_string = timezone_name_from_abbr('', intval($gmtoffset) * HOUR_IN_SECONDS, 0);
                }*/

                if ($timezone_string)
                {
                        // create time zone object
                        $timezone_object = timezone_open($timezone_string);
                        // create date object from time zone object
                        $localdateobject = date_create(null, $timezone_object);
                        // set time and date of $localdateobject to $timestamp
                        $datecomponents = isset($datecomponents) ? $datecomponents : getdate($timestamp);
                        date_date_set($localdateobject, $datecomponents['year'], $datecomponents['mon'], $datecomponents['mday']);
                        date_time_set($localdateobject, $datecomponents['hours'], $datecomponents['minutes'], $datecomponents['seconds']);
                        // format date according to the Wordpress time zone
                        $dateformated = date_format($localdateobject, $dateformatstring);
                }
                else
                {
                        // fall back if no Wordpress time zone set
                        $dateformated = date($dateformatstring, $i);
                }
        }

        return $dateformated;
}