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I have written a php code to grant access to logged in users with a privilege of "1" to a page and to login if logged in user does not have the access of "1". But when I test, it logs out all users instead

What I have tried:


$conn = mysqli_connect("localhost","root", "","bosmak_properties");

echo $_SESSION['user_name'];

$query=mysqli_query($conn,"SELECT * from users WHERE user_name =".$_SESSION['user_name']);
while ($row=mysqli_fetch_array($query)){
header ("Location: project_cost.php");
	header ("Location: login/logout.php");
Updated 15-Nov-20 0:29am
Richard MacCutchan 15-Nov-20 6:30am
Use the debugger to find out what values are being returned from the database. No one here can guess the results.
akynyemi 15-Nov-20 6:42am
Thanks Richard for the swift response. How do I do this please?
Gerry Schmitz 15-Nov-20 11:08am
Better safe than sorry.
Richard Deeming 16-Nov-20 3:12am
Your code is vulnerable to SQL Injection[^]. NEVER use string concatenation to build a SQL query. ALWAYS use a parameterized query.

PHP: SQL Injection - Manual[^]
PHP: Prepared statements and stored procedures - Manual[^]

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