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To add a selector (dropdown) field with a title to your user profile fields using the existing code, you can follow these steps:

1. Add the Selector Field to my_show_extra_profile_fields function:

function my_show_extra_profile_fields( $user ) {
    ?>
    <h3>Extra profile information</h3>
    <table class="form-table">
        <tr>
            <th><label for="description">Richiesta</label></th>
            <td>
                <input type="textarea" name="description" rows="5" cols="30" id="description" value="<?php echo esc_attr( get_the_author_meta( 'description', $user->ID ) ); ?>" class="regular-text" /><br />
                <span class="description">Richiesta del cliente.</span>
            </td>
        </tr>
        <tr>
            <th><label for="cell_two">N.Cellulare 2</label></th>
            <td>
                <input type="text" name="cell_two" id="cell_two" value="<?php echo esc_attr( get_the_author_meta( 'cell_two', $user->ID ) ); ?>" class="regular-text" /><br />
                <span class="description">Inserire il numero di cellulare n.2.</span>
            </td>
        </tr>
        <tr>
            <th><label for="cell">N.Cellulare</label></th>
            <td>
                <input type="text" name="cell" id="cell" value="<?php echo esc_attr( get_the_author_meta( 'cell', $user->ID ) ); ?>" class="regular-text" /><br />
                <span class="description">Inserire il numero di cellulare.</span>
            </td>
        </tr>
        <tr>
            <th><label for="payment_condition">Condizioni di pagamento</label></th>
            <td>
                <select name="payment_condition" id="payment_condition">
                    <option value="option1" <?php selected( get_the_author_meta( 'payment_condition', $user->ID ), 'option1' ); ?>>Option 1</option>
                    <option value="option2" <?php selected( get_the_author_meta( 'payment_condition', $user->ID ), 'option2' ); ?>>Option 2</option>
                    <option value="option3" <?php selected( get_the_author_meta( 'payment_condition', $user->ID ), 'option3' ); ?>>Option 3</option>
                </select>
                <br />
                <span class="description">Seleziona la condizione di pagamento.</span>
            </td>
        </tr>
    </table>
    <?php
}

Save the Selector Field Value:

function my_save_extra_profile_fields( $user_id ) {
    if ( ! current_user_can( 'edit_user', $user_id ) ) {
        return false;
    }

    update_usermeta( $user_id, 'cell_two', sanitize_text_field( $_POST['cell_two'] ) );
    update_usermeta( $user_id, 'description', sanitize_text_field( $_POST['description'] ) );
    update_usermeta( $user_id, 'cell', sanitize_text_field( $_POST['cell'] ) );
    update_usermeta( $user_id, 'payment_condition', sanitize_text_field( $_POST['payment_condition'] ) );
}

This code will add a dropdown field labeled “Condizioni di pagamento” (Payment Conditions) to your user profile section. The options in the dropdown correspond to the payment conditions you want to assign to each user. The selected() function ensures that the appropriate option is selected based on the saved value for that user.

Remember to replace the example option values and labels with your actual payment condition values.

Please make sure to backup your code and test these changes on a development/staging environment before applying them to your live website.

It looks like you’re experiencing deprecated errors related to the use of certain PHP functions in your WordPress theme’s functions.php file. Deprecated errors indicate that the functions you’re using are outdated and no longer recommended for use, as they might not be supported in future PHP versions. These errors can potentially cause issues like slow website performance.

In your case, the error message mentions the use of strpos() and str_replace() functions with null values as parameters. To resolve this issue and improve your website’s speed, you should locate the lines in your functions.php file where these functions are being used and update the code accordingly.

Here are the general steps you can follow:

1. Identify the Lines: Check the line numbers mentioned in the error message (e.g., line 7127 and line 2182) in your functions.php file. These are the lines where the deprecated functions are being used.
2. Review Code: Look for instances where strpos() and str_replace() functions are being used with null values as parameters. The functions should be used with valid strings and parameters.
3. Update Code: If you find the problematic code, update it to use valid values. Make sure you’re passing appropriate values to these functions.

Here’s an example of how you might use these functions correctly:

$haystack = "Some text to search in";
$needle = "text";
$new_text = "replacement";

if (strpos($haystack, $needle) !== false) {
    $new_haystack = str_replace($needle, $new_text, $haystack);
}

If you’re not comfortable with PHP coding, it might be a good idea to seek help from a developer or a technical expert who can review your functions.php file and fix the deprecated function usage. Additionally, if the deprecated functions are part of a theme or plugin you’re using, consider updating or replacing them with newer versions that are compatible with the latest PHP versions.

Remember to backup your functions.php file before making any changes to ensure you can revert back if needed.