diff --git a/utils/obfuscation-test.php b/utils/obfuscation-test.php
index 613f5e3..e8e42df 100644
--- a/utils/obfuscation-test.php
+++ b/utils/obfuscation-test.php
@@ -1,9 +1,10 @@
 <?php
 require_once(dirname(dirname(__FILE__)) . '/php-iban.php');
-$dir = dirname(__FILE__);
-$ibans = `cat $dir/example-ibans/*`;
-$lines = explode("\n",$ibans);
-foreach($lines as $iban) {
+$ibans = [];
+foreach (glob(dirname(__FILE__) . "/example-ibans/*") as $file) {
+ $ibans += file($file);
+}
+foreach($ibans as $iban) {
  $iban = iban_to_machine_format($iban);
  print iban_to_human_format($iban) . "\n";
  print iban_to_obfuscated_format($iban) . "\n";