php redirect issue

 

Guys, what am I doing wrong? The database "expiry" value is > 0 but I go to expiredpage.html.

<?php
$link = mysqli_connect("localhost", "root", "", "numbersdb"); 
// Check connection
if($link === false){ die("ERROR: Could not connect. " . mysqli_connect_error()); }
 
echo "<center>";echo date('m/d/y');echo "<br />";

$id='id';
$expiry='expiry';

if($expiry==7) {echo "1 week remaining on contract<br />";}
if($expiry==1) {echo "1 day remaining on contract<br />";}

if ($expiry==0) { header("location:expiredpage.html");  exit; } // not = 0, but goes there

// Perform a query, check for error
$sql = "UPDATE numberstbl SET $expiry = $expiry-1 where id=$id";
if(mysqli_query($link, $sql)){ echo "expiry was updated successfully."; } 
else { echo "ERROR: Could not able to execute $sql. " . mysqli_error($link); }
?>