Something
public text v1 · immutable<?php
$prenom = $_POST['prenom'];
$nom = $_POST['nom'];
print("<center>Bonjour $prenom $nom</center><br><br>");
?>
<html><body>
<form method="post" action="">
Nom : <input type="text" name="nom" size="12"><br>
Prénom : <input type="text" name="prenom" size="12">
<input type="submit" value="OK">
</form></body></html>