diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 689a682de3..0c369bea5b 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -5303,3 +5303,22 @@ function phpbb_convert_30_dbms_to_31($dbms)
 
 	throw new \RuntimeException("You have specified an invalid dbms driver: $dbms");
 }
+
+/**
+* Check whether phpBB is installed.
+*
+* @param string $phpbb_root_path	Path to the phpBB board root.
+* @param string $php_ext			PHP file extension.
+*
+* @return bool Returns true if phpBB is installed.
+*/
+function phpbb_check_installation_exists($phpbb_root_path, $php_ext)
+{
+	// Try opening config file
+	if (@file_exists($phpbb_root_path . 'config.' . $php_ext))
+	{
+		include($phpbb_root_path . 'config.' . $php_ext);
+	}
+
+	return defined('PHPBB_INSTALLED');
+}