3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<html> <head><title>Process</title></head> <body> <?php $error = ""; //check is field left empty //process registrarion form //checks that the form was actually submitted if($_POST['sub']) //submit button sub { //validation (server side) if ($_POST['name'] == "") //name = "name" $error .="Full name not entered <br />"; if(!isset($_POST['agree'])) //agree for TOS at form.php $error .="You must agree to the TOS"; if(!preg_match("/^\d{3}\.\d{3}\.\d{4}$/",$_POST['phone'])) $error .= "Invalid Phone Number"; //check if errors were found if($error !="") echo "<div style ='color:red;'>$error</div>"; } ?> </body> <html>
Output for 5.3.0 - 7.1.0
<html> <head><title>Process</title></head> <body> Notice: Undefined index: sub in /in/LGYvB on line 12 </body> <html>
Output for 4.3.0 - 5.2.17
<html> <head><title>Process</title></head> <body> Notice: Undefined index: sub in /in/LGYvB on line 12 </body> <html>