registrazione(esempio).php

<html>
<head>
<style>
body {
background-color: lightblue;
font-family: Arial, Helvetica, sans-serif;
}
* {
box-sizing: border-box;
}
.container {
padding: 16px;
background-color: white;
}
input[type=text], input[type=password] {
width: 100%;
padding: 15px;
margin: 5px 0 22px 0;
display: inline-block;
border: none;
background: #f1f1f1;
}
input[type=text]:focus, input[type=password]:focus {
background-color: #ddd;
outline: none;
}
hr {
border: 1px solid #f1f1f1;
margin-bottom: 25px;
}
.registerbtn {
background-color: #04AA6D;
color: white;
padding: 16px 20px;
margin: 8px 0;
border: none;
cursor: pointer;
width: 100%;
opacity: 0.9;
}
.registerbtn:hover {
opacity: 1;
}
a {
color: dodgerblue;
}
.signin {
background-color: #f1f1f1;
text-align: center;
}
}
</style>
</html>
<?php
if(empty($_POST['invia'])){
echo"<FORM ACTION='".$_SERVER['PHP_SELF']."'METHOD='POST'>";
echo "<p><center>database_registrazione";
echo"<fieldset>";
echo"<legend>registrazione</legend>";
echo"<body>";
echo"email:<br>";
echo"<input type='text' placeholder='email' name='email' required><br>";
echo"password:<br>";
echo"<input type='text' placeholder='password' name='password' required><br>";
echo"</div>";
echo"</fieldset>";
echo"<br><input type='submit' value='Invia'>";
echo "</center>";
echo"</body>";
echo "<br>";
echo"<br>";
echo"<a href=accedi(esempio).php>accedi</a>";
echo"</TABLE></FORM>";
}
$con=new mysqli("localhost","root","","esempio");
if(mysqli_connect_errno()){
echo("connesione_non_effetuata:".mysqli_connect_errno()."<BR>");
exit();
}
$email=isset($_POST['email'])?$_POST['email']:'';
$password=isset($_POST['password'])?$_POST['password']:'';
$sql="INSERT INTO registrazione(email,password)";
$sql.="VALUES('".$email."','".$password."');";
$ris=$con->query($sql) or die ("query_fallita");
$con->close();
?>