3v4l.org

run code in 300+ PHP versions simultaneously
<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 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
<html> <head><title>Process</title></head> <body> Warning: Undefined array key "sub" in /in/LGYvB on line 12 </body> <html>
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
<html> <head><title>Process</title></head> <body> Notice: Undefined index: sub in /in/LGYvB on line 12 </body> <html>
Output for 7.3.32 - 7.3.33, 7.4.26
<html> <head><title>Process</title></head> <body> </body> <html>
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
<html> <head><title>Process</title></head> <body> Notice: Undefined index: sub in /in/LGYvB on line 12 </body> <html>
preferences:
267.19 ms | 402 KiB | 354 Q