Language Names with Days of Week

langDays.php

<?php

function getLangInfo()
{
    $langs = ['da', 'de', 'en', 'es', 'fa', 'fr', 'it', 'pl', 'pt', 'ru', 'sv'];
    $ret = [];

    foreach ($langs as $lang) {
        $daysOfWeek = [];
        $lang_name = \Locale::getDisplayLanguage($lang, $lang);
        $lang_name_en = \Locale::getDisplayLanguage($lang, 'en');
        if (strlen($lang_name) < 3) {
            // If locale is invalid getDisplayLanguage just returns the provided locale
            // So this is how we handle errors as any language should have more than two chars
            // Skip language and move to the next one.
            continue;
        }
        // Capitalize the first letter of the language name
        $firstChar = mb_substr($lang_name, 0, 1, "utf-8");
        $then = mb_substr($lang_name, 1, null, "utf-8");
        $lang_name = mb_strtoupper($firstChar, "utf-8") . $then;

        // Populate the language data
        $ret[$lang]['name'] = $lang_name;
        $ret[$lang]['code'] = $lang;
        $ret[$lang]['en_name'] = $lang_name_en;

        // Populate the days of the week
        for ($i = 0; $i < 7; $i++) {
            $dateTime = new \DateTime("Sunday +{$i} days");
            $day = ucfirst(\IntlDateFormatter::formatObject($dateTime, 'cccc', $lang));
            $daysOfWeek[] = $day;
        }

        $ret[$lang]['days_of_week'] = $daysOfWeek;
    }
    return $ret;
}

echo json_encode(getLangInfo());