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How do I handle this error?

 2 years ago
source link: https://www.codeproject.com/Questions/5317530/How-do-I-handle-this-error
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I got this error

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Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, bool given in C:\xampp\htdocs\Login\signup.php:16 Stack trace: #0 C:\xampp\htdocs\Login\signup.php(16): mysqli_query(false, 'insert into use...') #1 {main} thrown in C:\xampp\htdocs\Login\signup.php on line 16


Please help me on how to fix it. Here's the code
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if (!empty($user_name) && !empty($password)) {
    // save to db
    $user_id = random_num(20);
    $query = "insert into users (user_id, user_name, password) values ('$user_id',' $user_name',' $password')";
    mysqli_query($query);

     header("Location: login.php");
     die;
  } else {
    {
      echo "Please enter some valid information";
    }
  }
}


What I have tried:

I tried adding mysqli_query($con, $query);

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