Egn class: A minor correction.

Signed-off-by:Ivan Tcholakov <[email protected]>

Author: ivantcholakov

Egn.php

@@ -137,6 +137,12 @@ public static function valid($egn) {
 
         $egn = (string) $egn;
 
+        // Added by Ivan Tcholakov, 25-JUN-2017.
+        if (!ctype_digit($egn)) {
+            return false;
+        }
+        //
+
         if (strlen($egn) != 10) {
             return false;
         }