Compare all rows in SQL table with a string - PHP

I want to get the contents of all rows in the SQL table and compare them with the contents of an html input. If I enter in the input the user and password of the first row the addressing to the page happens, if I enter the user and password of the second row nothing happens.

Php code:

"""

        include "config.php";
        $i = 0;
        $sql = "SELECT * FROM users";
        $result = mysqli_query($connection, $sql);
        $rowcount = mysqli_num_rows($result);
        while($row = $result->fetch_assoc()) {
            $userRow[$i] = $row["username"];
            $passRow[$i] = $row["password"];
            $complete[$i] = $row["username"]." ".$row["password"];
            $i++;
        }
        
        for ($i = 0; $i < $rowcount; $i++) {
            echo "<br>".$complete[$i]."</br>";
            echo "<br>$i</br>";
            if ($userRow[$i] == $username && password_verify($password, $passRow[$i])) { 
                echo "<br>Logged in</br>";
            }
        }

"""

source https://stackoverflow.com/questions/73602466/compare-all-rows-in-sql-table-with-a-string-php