Why is My mysqli Insert Failing Despite Passing Debug Checkpoints?

Inserting Data with mysqli: Troubleshooting a Failed Insert

This program attempts to insert data into a MySQL database using the mysqli extension. However, despite successfully passing through debug checkpoints, the data is not being added to the table.

The issue lies in the way the variables are bound to the prepared statement. In the original code, the variables $username and $password are bound twice using bind_param(). This is incorrect. The correct syntax is to pass the data types followed by the variables in one call to bind_param().

To fix this, the code can be modified as follows:

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

Alternatively, if using PHP 5.6 or later, the variable array can be passed to bind_param() using the spread operator:

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

Once this correction is made, the INSERT query should execute successfully and insert a new row into the database.

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