Issue #2307559 by undertext, donquixote, m1r1k, joelpittet: key_exists() is a...

Issue #2307559 by undertext, donquixote, m1r1k, joelpittet: key_exists() is a deprecated php function

includes/features.ctools.inc

@@ -112,7 +112,7 @@ function ctools_features_export_render($module, $data) {
     ctools_include('plugins');
     $plugin_api_hook_name = ctools_plugin_api_get_hook($info['module'], $info['api']);
 
-    if (key_exists($plugin_api_hook_name, $component_exports)) {
+    if (array_key_exists($plugin_api_hook_name, $component_exports)) {
       $component_exports[$plugin_api_hook_name]['code'] .= "\n" . implode("\n", $code);
     }
     else {