<?php
$nome = isset($_GET["nome"]) ? $_GET["nome"] : "";
$email = isset($_GET["email"]) ? $_GET["email"] : "";

echo "Nome: ".$nome."<br>";
echo "Email: ".$email."<br><br>";
?>
<form method="get">
	Nome: <input type="text" name="nome" value="<?=$nome?>"><br><br>
	Email: <input type="text" name="email" value="<?=$email?>"><br><br>
	<input type="submit" name="submit" value="Enviar">
</form>