How to Associate an Image with User Information Using MySQLi's `insert_id`?

Associating an Image with User Information

When inserting data across multiple tables with related information, it's essential to retrieve the last row's ID for use in the subsequent table insertion. To achieve this in PHP using MySQLi, you may encounter issues with the insert_id property.

To resolve this, you can utilize MySQL's auto_increment field for your ID column. This field will automatically generate a unique ID for each inserted row.

Once you have created the auto-increment field, you can retrieve the last inserted ID using the following code:

<?php
$last_id = mysqli_insert_id($conn);

Replace $conn with your MySQLi connection.

Now, you can use the $last_id to insert the image into the other table:

<?php
$stmt = $mysqli->prepare("
  insert into table1 (username, firstname, lastname, image) 
  select ?,?,?,? from table2 t2 where username = ? and t2.id = ?
");
$stmt->bind_param('sssss', $username, $fname, $lname, $last_id, $username);
$stmt->execute();

This will insert the image into table1, associating it with the user information from table2.

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