Added event to change meta fields of entries

src/elements/Entry.php

@@ -44,6 +44,7 @@
 use craft\enums\CmsEdition;
 use craft\enums\Color;
 use craft\enums\PropagationMethod;
+use craft\events\DefineEntryMetaFields;
 use craft\events\DefineEntryTypesEvent;
 use craft\events\ElementCriteriaEvent;
 use craft\fieldlayoutelements\entries\EntryTitleField;
@@ -117,6 +118,13 @@ class Entry extends Element implements NestedElementInterface, ExpirableElementI
      */
     public const EVENT_DEFINE_PARENT_SELECTION_CRITERIA = 'defineParentSelectionCriteria';
 
+    /**
+     * @event DefineEntryMetaFields The event that is triggered when defining the meta fields.
+     * @see metaFieldsHtml()
+     * @since 5.8.18
+     */
+    public const EVENT_DEFINE_META_FIELDS = 'defineEntryMetaFields';
+
     /**
      * @inheritdoc
      */
@@ -2567,6 +2575,18 @@ public function metaFieldsHtml(bool $static): string
 
         $fields[] = parent::metaFieldsHtml($static);
 
+         // Fire a 'defineEntryMetaFields' event
+        if ($this->hasEventHandlers(self::EVENT_DEFINE_META_FIELDS)) {
+            $event = new DefineEntryMetaFields([
+                'entry' => $this,
+                'static' => $static,
+                'fields' => $fields
+            ]);
+            $this->trigger(self::EVENT_DEFINE_META_FIELDS, $event);
+
+            return implode("\n", $event->fields);
+        }
+
         return implode("\n", $fields);
     }
 

src/events/DefineEntryMetaFields.php

@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * @link https://craftcms.com/
+ * @copyright Copyright (c) Pixel & Tonic, Inc.
+ * @license https://craftcms.github.io/license/
+ */
+
+namespace craft\events;
+
+
+use craft\elements\Entry;
+use craft\base\Event;
+
+/**
+ * class DefineEntryMetaFields
+ *
+ * @author Pixel & Tonic, Inc. <[email protected]>
+ * @since 5.8.18
+ */
+
+class DefineEntryMetaFields extends Event
+{
+    /**
+     * @var Entry The current entry
+     */
+    public Entry $entry;
+
+    /**
+     * @var bool Whether the fields should be static (non-interactive)
+     */
+    public bool $static;
+
+    /**
+     * @var array array of all meta fields
+     */
+    public array $fields;
+}