how can i get the value of COUNT(id) - php

Question

I'm encountering a problem with this object. I don't know (if it is possible), how to get the value of COUNT(id).
I tried $req[0]->COUNT(id) but "COUNT()" it detected it as a function. How could it be detect as a key?
Here's a var_dump($req):
object(stdClass)[4]
public 'COUNT(id)' => string '1' (length=1)
PHP
$req = $db->query('SELECT COUNT(id) FROM `users` WHERE username ="'.$username.'" AND password = "'.$password.'"');
if($req == 1){
$_SESSION['authentificated'] = true;
$_SESSION['username'] = $username;
}
var_dump($req);
The output of the query should be 0 or 1 if the user is already register or not.

Answer 1

1.You need to add alias for COUNT()
2.After query execution you need to fetch record and then do the comparison
Do like below:-
$req = $db->query('SELECT COUNT(id) as count FROM `users` WHERE username ="'.$username.'" AND password = "'.$password.'"');
$result = mysqli_fetch_assoc($req); // sample example,you need to change accordingly
if($result['count'] == 1){
//your code
}
Note:-
Saving plain password is very bad idea. so use password hashing
Your current code is wide-open for SQL INJECTION. To prevent from it use prepared statements
mysqli::prepare
PDO::prepare
I will do it something like this: https://3v4l.org/YOBGX

Answer 2

Here alias required or else it won't capture that count value the way you want.
$req = $db->query('SELECT COUNT(id) cnt FROM `users` WHERE username ="'.$username.'" AND password = "'.$password.'"');
var_dump($req);

Answer 3

Here is the solution you have not bind the key for that please see below
$req = $db->query('SELECT COUNT(id) as user_exists FROM `users` WHERE username
="'.$username.'" AND password = "'.$password.'"');
if($req == 1){
$_SESSION['authentificated'] = true;
$_SESSION['username'] = $username;
}
var_dump($req);

Answer 4

Try this --
$req = mysqli_query($db,'SELECT (COUNT(id)) as countID FROM `users` WHERE username ="'.$username.'" AND password = "'.$password.'"'));
$row = mysqli_fetch_array($req);
$countID = $row['countID'];
if($countID == 1){
$_SESSION['authentificated'] = true;
$_SESSION['username'] = $username;
}
var_dump($req);