ASA

function generate_student_number( $user_id ) {

    // Generate a unique student number, e.g., STU + random 6 digits

    $student_number = 'STU-' . strtoupper( wp_generate_password( 6, false ) );

    // Save the student number to user meta

    update_user_meta( $user_id, 'student_number', $student_number );

}

add_action( 'user_register', 'generate_student_number' );

// Display Student Number in User Profile (optional)

function show_student_number_in_profile( $user ) {

    $student_number = get_user_meta( $user->ID, 'student_number', true );

    ?>

    <h3>Student Information</h3>

    <table class="form-table">

        <tr>

            <th><label for="student_number">Student Number</label></th>

            <td>

                <input type="text" name="student_number" id="student_number" value="<?php echo esc_attr( $student_number ); ?>" class="regular-text" readonly />

            </td>

        </tr>

    </table>

    <?php

}

add_action( 'show_user_profile', 'show_student_number_in_profile' );

add_action( 'edit_user_profile', 'show_student_number_in_profile' );