Fix PHP 5.5 compat for array const (#2360)

https://github.com/FreshRSS/FreshRSS/issues/2359

app/Controllers/configureController.php

@@ -166,7 +166,8 @@ class FreshRSS_configure_Controller extends Minz_ActionController {
 	 * tab and up.
 	 */
 	public function shortcutAction() {
-		$this->view->list_keys = SHORTCUT_KEYS;
+		global $SHORTCUT_KEYS;
+		$this->view->list_keys = $SHORTCUT_KEYS;
 
 		if (Minz_Request::isPost()) {
 			FreshRSS_Context::$user_conf->shortcuts = validateShortcutList(Minz_Request::param('shortcuts'));

lib/lib_rss.php

@@ -549,7 +549,7 @@ function _i($icon, $url_only = false) {
 }
 
 
-const SHORTCUT_KEYS = array(
+$SHORTCUT_KEYS = array(	//No const for < PHP 5.6 compatibility
 			'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
 			'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
 			'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
@@ -559,6 +559,7 @@ const SHORTCUT_KEYS = array(
 		);
 
 function validateShortcutList($shortcuts) {
+	global $SHORTCUT_KEYS;
 	$legacy = array(
 			'down' => 'ArrowDown', 'left' => 'ArrowLeft', 'page_down' => 'PageDown', 'page_up' => 'PageUp',
 			'right' => 'ArrowRight', 'up' => 'ArrowUp',
@@ -567,17 +568,17 @@ function validateShortcutList($shortcuts) {
 	$shortcuts_ok = array();
 
 	foreach ($shortcuts as $key => $value) {
-		if (in_array($value, SHORTCUT_KEYS)) {
+		if (in_array($value, $SHORTCUT_KEYS)) {
 			$shortcuts_ok[$key] = $value;
 		} elseif (isset($legacy[$value])) {
 			$shortcuts_ok[$key] = $legacy[$value];
 		} else {	//Case-insensitive search
 			if ($upper === null) {
-				$upper = array_map('strtoupper', SHORTCUT_KEYS);
+				$upper = array_map('strtoupper', $SHORTCUT_KEYS);
 			}
 			$i = array_search(strtoupper($value), $upper);
 			if ($i !== false) {
-				$shortcuts_ok[$key] = SHORTCUT_KEYS[$i];
+				$shortcuts_ok[$key] = $SHORTCUT_KEYS[$i];
 			}
 		}
 	}