PHP PDO select entry from database that matches a variable - php

Question

I've looked at some of the other answers on here regarding this but I keep getting errors so here goes.
Whenver a user visits the site, they are asked to provide their name and are assigned a random integer. When they hit submit to enter their name the form gets submitted and saved to the database and the user gets redirected back to the main page. If the random number once again matches a number saved in the database, that name gets displayed.
I have no problem inserting values into the database but I am having some issues retrieving them back out.
My connection to the database is fine, just left the values generic for the purpose of this question.
<?php
$min=1;
$max=100;
$rand_number = rand($min,$max);
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
//Set PDO Error Mode to Exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
//Prepare SQL
$stmt = $conn->prepare("select nickname from users where number=".$rand_number);
$stmt->execute();
if (!$stmt) {
foreach($result as $row) {
echo $row['nickname'];
}
}
}
?>
I'm getting an error that something is wrong around the part where I'm matching the query to the variable.

Answer 1

The only thing I really see missing is where you would fetch the data. You can either use one of the fetch* methods of PDOStatement or simply iterate the statement itself (it implements Traversable).
Also, you should use parameter binding.
$stmt = $conn->prepare('SELECT `nickname` FROM `users` WHERE `number` = ?');
$stmt->execute([$rand_number]);
while($nickname = $stmt->fetchColumn()) {
echo $nickname;
}