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PHP

Posted by Konrad Pilch
Konrad Pilch
2,435 Points

PHP After a line it crashes

HI,

Why it doesnt wokr? i mean after i write the line where i put the comment, it doesnt work. It works if i just echo soemthing but it wonrt if i write this code. WHy is that?

<?php

if(isset($_POST['username'])&&isset($_POST['password'])){
    $username = $_POST['username'];
    $password = $_POST['password'];

    $password_hash = md5($password);

    if(!empty($username) &&!empty($password)) {

        $query = "SELECT `id` FROM `users` WHERE `username`='$username' AND `password`='$password_hash'";
        if ($query_run = mysqli_query($con, $query)) {
            $query_num_rows = mysqli_num_rows($query_run);

            if ($query_num_rows==0) {
                echo 'Invalid username/password combination.';
            } else if ($query_num_rows==1) {
                echo $user_id = mysqli_result($query_run, 0, 'id'); // After this line it doenst work
            }
        }


    } else{
        echo 'You must supply a username and password.';
    }
}

?>
<form action="<?php echo $current_file; ?>" method="POST">
    Username: <input type="text" name="username">
    Password: <input type="password" name="password">
    <input type="submit" value="Log in">
</form>
Zachary Green
Zachary Green
16,359 Points

What do you mean not work?

Konrad Pilch
Konrad Pilch
2,435 Points

After i add the line where is comment, it wont echo the user id which shoudl echo the user id . When i put just echo " ok"; It does work. But i need this code. If i log in to user alex password1 , it should show user id 1 , if i log in to billi pass123 , it should echo user id 2 . It wont . The code it self is half highlighted.

1 Answer

Zachary Green
Zachary Green
16,359 Points
Zachary Green
Zachary Green
16,359 Points

i think i found your problem. mysqli_result is not a method but a class. try mysqli_fetch_assoc

post to give more info: http://stackoverflow.com/questions/17707331/fatal-error-call-to-undefined-function-mysqli-result

mysqli docs: http://php.net/manual/en/book.mysqli.php

also as a side note have you thought of using pdo for db calls?

Konrad Pilch
Konrad Pilch
2,435 Points

Thank you but It still doesn't work .

Im using this 

<?php

$mysqli_host = 'localhost';
$mysqli_user = 'root';
$mysqli_pass = 'root';

$mysqli_db = 'a_database';

error_reporting(E_ALL);  // reports all errors to make it easier to debug

$con = mysqli_connect($mysqli_host, $mysqli_user, $mysqli_pass);

if (!$con) {
    die("Could not connect to the database server");
} elseif (!mysqli_select_db($con, $mysqli_db)) {
    echo "Could not select the database<br />";
    die(mysqli_error($con));
}

?>

But i did use pdo in other projects or rather learning .