Insert statement only inserting some of the data to the database - php

Question

I hope my title makes sense, cause I don't know how to phrase it any shorter.
I am doing a login and sign up form with parameters and hashing. I have used parameters before but never in a signup form.
So the issue it that when I make a new a user it ONLY inserts the password but not the username. I have tried to change the name of the username, I have checked the connection to the database is correct and I am simply lost of what to do now.
My database can be seen here:
$username = $password = $confirm_password = "";
$username_err = $password_err = $confirm_password_err = "";
// Processing form data when form is submitted
if($_SERVER["REQUEST_METHOD"] == "POST"){
// Validate username
if(empty(trim($_POST["username"]))){
$username_err = "Please enter a username.";
} else{
// Prepare a select statement
$sql = "SELECT id FROM user WHERE username = ?";
if($stmt = mysqli_prepare($conn, $sql)){
// Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "s", $param_username);
// Set parameters
$param_username = trim($_POST["username"]);
// Attempt to execute the prepared statement
if(mysqli_stmt_execute($stmt)){
/* store result */
mysqli_stmt_store_result($stmt);
if(mysqli_stmt_num_rows($stmt) == 1){
$username_err = "This username is already taken.";
} else{
$username = trim($_POST["username"]);
}
} else{
echo "Oops! Something went wrong. Please try again later.";
}
}
// Close statement
mysqli_stmt_close($stmt);
}
// Validate password
if(empty(trim($_POST['password']))){
$password_err = "Please enter a password.";
} elseif(strlen(trim($_POST['password'])) < 6){
$password_err = "Password must have atleast 6 characters.";
} else{
$password = trim($_POST['password']);
}
// Validate confirm password
if(empty(trim($_POST["confirm_password"]))){
$confirm_password_err = 'Please confirm password.';
} else{
$confirm_password = trim($_POST['confirm_password']);
if($password != $confirm_password){
$confirm_password_err = 'Password did not match.';
}
}
// Check input errors before inserting in database
if(empty($username_err) && empty($password_err) &&
empty($confirm_password_err)){
// Prepare an insert statement
$sql = "INSERT INTO user (name, password) VALUES (?, ?)";
if($stmt = mysqli_prepare($conn, $sql)){
// Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "ss", $param_username,
$param_password);
// Set parameters
$param_username = $username;
$param_password = password_hash($password, PASSWORD_DEFAULT);
// Creates a password hash
// Attempt to execute the prepared statement
if(mysqli_stmt_execute($stmt)){
// Redirect to login page
// header("location: login.php");
echo "You have been added";
} else{
echo "Something went wrong. Please try again later.";
}
}
// Close statement
mysqli_stmt_close($stmt);
}
// Close connection
mysqli_close($conn);
}
?>
<?php
include "header.php";
?>
<div class="wrapper">
<h2>Sign Up</h2>
<p>Please fill this form to create an account.</p>
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?
>" method="post">
<div class="form-group <?php echo (!empty($username_err)) ?
'has-error' : ''; ?>">
<label>Username</label>
<input type="text" name="username"class="form-control"
value="<?php echo $username; ?>">
<span class="help-block"><?php echo $username_err; ?>
</span>
</div>
<div class="form-group <?php echo (!empty($password_err)) ?
'has-error' : ''; ?>">
<label>Password</label>
<input type="password" name="password" class="form-control"
value="<?php echo $password; ?>">
<span class="help-block"><?php echo $password_err; ?>
</span>
</div>
<div class="form-group <?php echo
(!empty($confirm_password_err)) ? 'has-error' : ''; ?>">
<label>Confirm Password</label>
<input type="password" name="confirm_password" class="form-
control" value="<?php echo $confirm_password; ?>">
<span class="help-block"><?php echo $confirm_password_err;
?></span>
</div>
<div class="form-group">
<input type="submit" class="btn btn-primary"
value="Submit">
<input type="reset" class="btn btn-default" value="Reset">
</div>
<p>Already have an account? Login here.
</p>
</form>
</div>
<footer>
<?php
include "footer.php";
?> </footer>
Hope you can help me, feel free to ask questions if I haven't made myself clear enough :)

Answer 1

Remove the following line
$param_username = $username;
Because you overwrite $param_username that is already set with trim($_POST["username"])
Have a nice day.

Answer 2

It turnes out the $username = $password = $confirm_password = ""; was clearing my textbox so I removed it and added a $username = $_POST["username"]; and then the code worked.