Fix deprecation notices in the backend module

modules/backend/behaviors/importexportcontroller/TranscodeFilter.php

@@ -17,7 +17,7 @@ class TranscodeFilter extends php_user_filter
 
     protected $encodingTo;
 
-    public function filter($in, $out, &$consumed, $closing)
+    public function filter($in, $out, &$consumed, bool $closing): int
     {
         while ($resource = stream_bucket_make_writeable($in)) {
             if (in_array($this->encodingFrom, mb_list_encodings())) {
@@ -42,7 +42,7 @@ public function filter($in, $out, &$consumed, $closing)
         return PSFS_PASS_ON;
     }
 
-    public function onCreate()
+    public function onCreate(): bool
     {
         if (strpos($this->filtername, self::FILTER_NAME) !== 0) {
             return false;
@@ -70,7 +70,7 @@ public function onCreate()
         return true;
     }
 
-    public function onClose()
+    public function onClose(): void
     {
         setlocale(LC_CTYPE, $this->params['locale']);
     }

modules/backend/classes/FilterScope.php

@@ -101,12 +101,12 @@ public function __construct($scopeName, $label)
      * Specifies a scope control rendering mode. Supported modes are:
      * - group - filter by a group of IDs. Default.
      * - checkbox - filter by a simple toggle switch.
-     * @param string $type Specifies a render mode as described above
+     * @param string|null $type Specifies a render mode as described above
      * @param array $config A list of render mode specific config.
      */
-    public function displayAs($type, $config = [])
+    public function displayAs(?string $type, $config = [])
     {
-        $this->type = strtolower($type) ?: $this->type;
+        $this->type = strtolower($type ?? '') ?: $this->type;
         $this->config = $this->evalConfig($config);
         return $this;
     }

modules/backend/classes/FormField.php

@@ -254,17 +254,17 @@ public function options($value = null)
      * - checkbox - creates a single checkbox.
      * - checkboxlist - creates a checkbox list.
      * - switch - creates a switch field.
-     * @param string $type Specifies a render mode as described above
+     * @param string|null $type Specifies a render mode as described above
      * @param array $config A list of render mode specific config.
      */
-    public function displayAs($type, $config = [])
+    public function displayAs(?string $type, $config = [])
     {
         if (in_array($type, ['textarea', 'widget'])) {
             // defaults to 'large'
             $this->size = 'large';
         }
 
-        $this->type = strtolower($type) ?: $this->type;
+        $this->type = strtolower($type ?? '') ?: $this->type;
         $this->config = $this->evalConfig($config);
 
         return $this;

modules/backend/classes/ListColumn.php

@@ -126,11 +126,11 @@ public function __construct($columnName, $label)
      * Specifies a list column rendering mode. Supported modes are:
      * - text - text column, aligned left
      * - number - numeric column, aligned right
-     * @param string $type Specifies a render mode as described above
+     * @param string|null $type Specifies a render mode as described above
      */
-    public function displayAs($type, $config)
+    public function displayAs(?string $type, $config)
     {
-        $this->type = strtolower($type) ?: $this->type;
+        $this->type = strtolower($type ?? '') ?: $this->type;
         $this->config = $this->evalConfig($config);
         return $this;
     }