diff --git a/README.md b/README.md
index 673b473..7502e69 100644
--- a/README.md
+++ b/README.md
@@ -25,13 +25,9 @@ PHP contributed by @txt3rob
 ```php
 function is_temp_mail($mail) {
     $mail_domains_ko = file('disposable_email_blacklist.conf', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
-    foreach($mail_domains_ko as $ko_mail) {
-        list($mail_address, $mail_domain) = explode('@',$mail);
-        if(strcasecmp($mail_domain, $ko_mail) == 0){
-            return true;
-        }
-    }
-    return false;
+
+    //Need to ensure the mail contains an @ to avoid undefined offset
+    return in_array(explode('@', $mail)[1], $mail_domains_ko);
 }
 ```