<form action="" method="post">
First name: <input type="text" name="first"><br />
Last name: <input type="text" name="last"><br />
Address: <input type="text" name="address"><br />
Age (must be number): <input type="text" name="age">
<input type="submit" name="submit" value="submit">
</form>
<?php

$hostname="localhost";
$username="root";
$password="zRx181962";
$link = mysqli_connect ($hostname,$username,$password);

mysqli_select_db($link, "bethcustomers");

if(isset($_POST["first"])){
	$first = mysqli_real_escape_string($link,$_POST["first"]);
	$last = mysqli_real_escape_string($link,$_POST["last"]);
	$address = mysqli_real_escape_string($link,$_POST["address"]);
	$age = mysqli_real_escape_string($link,$_POST["age"]);
	$query = "INSERT INTO customers(first,last,address,age) VALUES('$first','$last','$address',$age)";
	$result = mysqli_query($link,$query);
}

?>

<table cellspacing=1 cellpadding=3 border=1>
<tr><th><a href="?sort=first">First</a></th><th><a href="?sort=last">Last</a></th><th><a href="?sort=address">Address</a></th><th><a href="?sort=age">Age</a></th></tr>
<?php
$query = "SELECT * FROM customers ORDER BY last";
$result = mysqli_query($link,$query);
while($r=mysqli_fetch_array($result,MYSQLI_ASSOC)){
	echo "<tr><td>".$r["first"]."</td><td>".$r["last"]."</td><td>".$r["address"]."</td><td>".$r["age"]."</td></tr>\n";
}
?>
</table>