+ * @param string $headerLocale Locale send in HTTP headers (e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3").
+ **/
+function autoLocale($headerLocale)
+{
+ // Default if browser does not send HTTP_ACCEPT_LANGUAGE
+ $locales = ['en_US', 'en_US.utf8', 'en_US.UTF-8'];
+ if (! empty($headerLocale)) {
+ if (preg_match_all('/([a-z]{2,3})[-_]?([a-z]{2})?,?/i', $headerLocale, $matches, PREG_SET_ORDER)) {
+ $attempts = [];
+ foreach ($matches as $match) {
+ $first = [strtolower($match[1]), strtoupper($match[1])];
+ $separators = ['_', '-'];
+ $encodings = ['utf8', 'UTF-8'];
+ if (!empty($match[2])) {
+ $second = [strtoupper($match[2]), strtolower($match[2])];
+ $items = [$first, $separators, $second, ['.'], $encodings];
+ } else {
+ $items = [$first, $separators, $first, ['.'], $encodings];
+ }
+ $attempts = array_merge($attempts, iterator_to_array(cartesian_product_generator($items)));
+ }
+
+ if (! empty($attempts)) {
+ $locales = array_merge(array_map('implode', $attempts), $locales);
+ }
+ }
+ }
+
+ setlocale(LC_ALL, $locales);
+}
+
+/**
+ * Build a Generator object representing the cartesian product from given $items.
+ *
+ * Example:
+ * [['a'], ['b', 'c']]
+ * will generate:
+ * [
+ * ['a', 'b'],
+ * ['a', 'c'],
+ * ]
+ *
+ * @param array $items array of array of string
+ *
+ * @return Generator representing the cartesian product of given array.
+ *
+ * @see https://en.wikipedia.org/wiki/Cartesian_product
+ */
+function cartesian_product_generator($items)
+{
+ if (empty($items)) {
+ yield [];
+ }
+ $subArray = array_pop($items);
+ if (empty($subArray)) {
+ return;
+ }
+ foreach (cartesian_product_generator($items) as $item) {
+ foreach ($subArray as $value) {
+ yield $item + [count($item) => $value];
+ }
+ }
+}
+
+/**
+ * Generates a default API secret.