Added the delete_cookie() function in order to help with the removal …

…of cookies that might have been set. Although one can make use of the set_cookie() function and pass an 0 via the expire field, this is a simpler method

system/core/Input.php

@@ -225,6 +225,27 @@ public function cookie($index = '', $xss_clean = FALSE)
 
 	// ------------------------------------------------------------------------
 
+	/**
+	 * Remove cookie
+	 * 
+	 * Accepts the name of the cookie and expires it accordingly
+	 *
+	 * @param 	string 		the name of the cookie
+	 * @return 	bool
+	 */
+	public function delete_cookie($name = '')
+	{
+		if( isset($name) && !empty($name) && $this -> cookie( $name ) ) // Check if the cookie exists, just a failsafe, one never knows.... :)
+		{
+			$this -> set_cookie( $name, '', 0 );
+			return true; // Let the calling function know that it succeeded
+		}
+
+		return false; // Could not find the cookie, or no name provided
+	}
+
+	// ------------------------------------------------------------------------
+
 	/**
 	* Set cookie
 	*