[ticket/16737] Rewrite acp_search index pages

PHPBB3-16737

phpBB/phpbb/search/backend/base.php

@@ -480,4 +480,12 @@ abstract class base implements search_backend_interface
 
 		return $max_post_id;
 	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function get_type(): string
+	{
+		return static::class;
+	}
 }

phpBB/phpbb/search/backend/fulltext_sphinx.php

@@ -1022,4 +1022,12 @@ class fulltext_sphinx implements search_backend_interface
 
 		return true;
 	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function get_type(): string
+	{
+		return static::class;
+	}
 }

phpBB/phpbb/search/backend/search_backend_interface.php

@@ -193,4 +193,11 @@ interface search_backend_interface
 	 * @return array array containing template and config variables
 	 */
 	public function get_acp_options(): array;
+
+	/**
+	 * Gets backend class
+	 *
+	 * @return string
+	 */
+	public function get_type(): string;
 }