通过从MySQL获取id将$ _SESSION ['name']更改为$ _SESSION ['id]

Question

I have a log in form, that starts with session email. Now since I want to be able to update the email address by a form, without broke the session I need to change the session to the id. The problem is that it wont send me the id value to the session, it only gives me value 1, like this: www.mysite.com/profile.php?uid=1 instead of returning the real id number.

Any ideas?

<?php
if(isset($_SESSION['email'])){
    $_SESSION['uid'] = fetch_user_id($_SESSION['email']);
    header("Location: profile.php?uid=" . $_SESSION['uid']);
    die();
}
?> 

<?php 
function fetch_user_id($email){
    global $db;
    $query = $db->query("SELECT id FROM user WHERE email='{$_SESSION['email']}'");
    $row = $query->fetch(PDO::FETCH_ASSOC);
    return true;
} 
?>

Answer 1

$row是存储结果ie（数组）找到的结果，你想要的是$row['id']

Answer 2

That is because you are returning the value true from your fetch_user_id function. In order to get the correct results you need to return the users id from the $row array.

function fetch_user_id($email) {
    global $db;
    $query = $db->query("SELECT id FROM user WHERE email='{$_SESSION['email']}'");
    $row = $query->fetch(PDO::FETCH_ASSOC);
    return $row['uid']; // whatever your user id column is called
}