Get informations from two tables - php

Question

I have a domain where users have a subdomain with its own name.
Example:
User: Vitor
Subdomain: vitor.google.com
The database has the column user table my_users and have the columns birthday, address, password, city and state in table users_infos.
How do I do that in PHP in index.php can get this information direct user to the database?
this is my incorrect code:
// Get Subdomain
$urlExplode = explode('.', $_SERVER['HTTP_HOST']);
if (count($urlExplode) > 2 && $urlExplode[0] !== 'www') {
$subdomain = $urlExplode[0];
echo $subdomain;
}
// Select DB
$sql = "SELECT * FROM users_infos i INNER JOIN my_users u on u.id = i.id where u.users='$users'";
$result = mysql_query($sql);
if($result === FALSE) {
die(mysql_error());
// TODO: better error handling
}
else {
$row = mysql_fetch_array($result);
$userTitleSite = $row['userTitleSite'];
echo $id_textos = $row["id_textos"];
echo "<br />";
echo $id = $row["id"];
echo "<br />";
echo $phone = $row["phone"];
echo "<br />";
echo "<br />";
}
// Says that the subdomain is = user
$subdomain = $user;
Correct answer below:
Using the help you gave me, it looks like I got here ..
follows the correct code I could do for future users who have the same question:
// Get subdomain
$urlExplode = explode('.', $_SERVER['HTTP_HOST']);
if (count($urlExplode) > 2 && $urlExplode[0] !== 'www') {
$subdomain = $urlExplode[0];
echo $subdomain;
}
// Says that the subdomain is = user
$user = $subdomain;
// Select DB
$sql = "SELECT * FROM vms_textos i INNER JOIN vms_users u on u.id = i.id where u.user='$user'";
$result = mysql_query($sql);
if($result === FALSE) {
die(mysql_error());
// TODO: better error handling
}
else {
$row = mysql_fetch_array($result);
$userTitleSite = $row['userTitleSite'];
echo "<br />";
echo $id_textos = $row["id_textos"];
echo "<br />";
echo $user= $row["user"];
echo "<br />";
echo $id = $row["id"];
echo "<br />";
echo $telefone = $row["telefone"];
echo "<br />";
echo "<br />";
}
echo "<br />";
echo "<br />";
Thanks all for help me! :)

Answer 1

$subdomain = $user;
Should go before the $sql, as your code is written $user is empty.

Answer 2

Are you sure the WHERE clause u.id = i.id is correct? In other words, do the ID columns in your my_users and users_infos table match? It is more common to have a foreign key reference on the users_infos table (e.g. my_users_id), in which case the query would be something like:
SELECT *
FROM users_infos i
INNER JOIN my_users u on u.id = i.my_users_id
WHERE u.users='$users'