Fix function declaration + undefined variable

main/inc/lib/plugin.class.php

@@ -924,7 +924,7 @@ class Plugin
      *
      * @return bool True if plugin is installed/enabled, false otherwise
      */
-    public function isEnabled($checkEnabled = false)
+    public function isEnabled(bool $checkEnabled = false): bool
     {
         $settings = api_get_settings_params_simple(
             [

plugin/bbb/lib/VM.php

@@ -30,7 +30,7 @@ class VM
      * @param   bool    $checkEnabled   Check if, additionnally to being installed, the plugin is enabled
      * @return bool
      */
-    public function isEnabled($checkEnabled = false)
+    public function isEnabled(bool $checkEnabled = false): bool
     {
         $config = $this->getConfig();
 

plugin/buycourses/src/buy_course_plugin.class.php

@@ -135,7 +135,7 @@ class BuyCoursesPlugin extends Plugin
      *
      * @return bool
      */
-    public function isEnabled(bool $checkEnabled = false)
+    public function isEnabled(bool $checkEnabled = false): bool
     {
         return $this->get('paypal_enable') || $this->get('transfer_enable') || $this->get('culqi_enable') || $this->get('stripe_enable') || $this->get('cecabank_enable');
     }
@@ -3469,7 +3469,7 @@ class BuyCoursesPlugin extends Plugin
         string $name = null,
         int $min = 0,
         int $max = 0,
-        mixed $appliesTo = '',
+        $appliesTo = '',
         string $typeResult = 'all'
     ) {
         $servicesTable = Database::get_main_table(self::TABLE_SERVICES);

plugin/lti_provider/LtiProviderPlugin.php

@@ -32,6 +32,8 @@ class LtiProviderPlugin extends Plugin
         $launchUrlHtml = '';
         $loginUrlHtml = '';
         $redirectUrlHtml = '';
+        $jwksUrlHtml = '';
+
         if ($this->areTablesCreated()) {
             $publicKey = $this->getPublicKey();
 

plugin/whispeakauth/WhispeakAuthPlugin.php

@@ -406,7 +406,7 @@ class WhispeakAuthPlugin extends Plugin implements HookPluginInterface
      *
      * @return bool
      */
-    public function isEnabled($checkEnabled = false)
+    public function isEnabled(bool $checkEnabled = false): bool
     {
         return parent::isEnabled() && 'true' === api_get_plugin_setting('whispeakauth', self::SETTING_ENABLE);
     }