Enforced API security

functions/url.php

@@ -0,0 +1,31 @@
+<?php
+/**
+ * URL functions
+ *
+ * @author Pierre HUBERT
+ */
+
+
+/**
+ * Determine the domain of an URL
+ *
+ * @param String $url The URL to analyse
+ * @return String The domain of the URL
+ */
+function get_url_domain($url){
+
+	//First, check for "://"
+	if(!preg_match("<://>", $url))
+		return false;
+	
+	//Then split the URL
+	$path = strstr($url, "://");
+	$path = str_replace("://", "", $path);
+
+	//Check if we are at the root of the domain or not
+	if(!preg_match("</>", $path))
+		return $path;
+	
+	//Else the url is a little more complex
+	return explode("/", $path)[0];
+}