diff --git a/core/util.inc.php b/core/util.inc.php
index e1372eb2..6a625727 100644
--- a/core/util.inc.php
+++ b/core/util.inc.php
@@ -128,6 +128,14 @@ EOD;
 	}
 }
 
+function check_cli() {
+	if(isset($_SERVER['REMOTE_ADDR'])) {
+		print "This script is to be run from the command line only.";
+		exit;
+	}
+	$_SERVER['REMOTE_ADDR'] = "127.0.0.1";
+}
+
 function get_thumbnail_size($orig_width, $orig_height) {
 	global $config;