Why is My MySQLi Insertion Failing Despite Passing All Debug Checks?

Inserting Data using MySQLi

This code seems to be executing all the debug checks, but it fails to insert new data into the database. Let's analyze it step by step.

The code attempts to check if the "username" already exists in the "UserData" table. If not, it tries to add a new row. However, it encounters an issue during the insertion part.

Identifying the Issue

The problem lies in the way the bind parameters are declared for the insertion statement. Instead of passing individual variables multiple times (e.g., $username, $password twice), they should be passed together with their corresponding types.

Solution

The bind_param function expects the variable types to precede the variables themselves. Hence, the correct way to bind the parameters is:

$stmt2->bind_param('ss', $username, $password);

Alternatively, if you're using PHP 5.6 or later, you can simplify this using the spread operator (...):

$data = ['user' => 'someUser', 'password' => 'secret'];
$stmt2->bind_param('ss', ...$data);

Once the parameters are bound correctly, the insertion should succeed. Note that the code provided in your question has some comments that are potentially confusing or unnecessary; removing them for clarity is recommended.

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