user-price.php

<?php
/*
Plugin Name: Woocommerce User Price
Plugin URI: http://codemypain.com
Description: Assign specific price per product to users.
Version: 1.0.2
Author: Isaac Oyelowo
Author URI: https://isaacoyelowo.dev
Tested up to: Woocommerce 8x
*/

class ISAAC_Price {

    public function __construct() {
        add_action('woocommerce_get_price_html', array($this, 'user_price'));
        add_action('init', array($this, 'localize'));
        add_action('woocommerce_add_to_cart', array($this, 'add_to_cart_hook'));
        add_action('woocommerce_before_calculate_totals', array($this, 'add_custom_price'));
        add_action('show_user_profile', array($this, 'custom_user_profile_fields'));
        add_action('edit_user_profile', array($this, 'custom_user_profile_fields'));
        add_action('admin_enqueue_scripts', array($this, 'load_admin_scripts'));
        add_action('personal_options_update', array($this, 'update_extra_profile_fields'));
        add_action('edit_user_profile_update', array($this, 'update_extra_profile_fields'));
    }

    public function localize() {
        load_plugin_textdomain('user_price', false, dirname(plugin_basename(__FILE__)) . "/languages");
    }

    public function load_admin_scripts() {
        wp_register_script('usr_settings', plugins_url('/includes/js/admin/settings.js', __FILE__));
        wp_enqueue_script('usr_settings');
    }

    public function user_price($price) {
        global $product;
        $user = wp_get_current_user();
        $isaac_price = (array) get_user_meta($user->ID, 'special_prices', true);

        foreach ($isaac_price as $user_price) {
            if ($product->get_id() == $user_price['item_number']) {
                $formatted_price = wc_price($user_price['price']);

                if (!empty($user_price['price_suffix'])) {
                    $formatted_price .= ' ' . $user_price['price_suffix'];
                }

                return $formatted_price;
            }
        }

        return $price;
    }

    public function add_to_cart_hook($key) {
        global $woocommerce;
        $user = wp_get_current_user();
        $isaac_price = (array) get_user_meta($user->ID, 'special_prices', true);

        foreach ($isaac_price as $user_price) {
            foreach ($woocommerce->cart->get_cart() as $cart_item_key => $values) {
                if ($values['product_id'] == $user_price['item_number']) {
                    $new_price = wc_format_decimal($user_price['price']);
                    $values['data']->set_price($new_price);
                    $woocommerce->session->__set($cart_item_key . '_named_price', $new_price);
                }
            }
        }

        return $key;
    }

    public function add_custom_price($cart_object) {
        global $woocommerce;

        foreach ($cart_object->cart_contents as $key => $value) {
            $named_price = $woocommerce->session->__get($key . '_named_price');

            if ($named_price) {
                $value['data']->set_price($named_price);
            }
        }
    }

    public function custom_user_profile_fields($user) {
        if (!current_user_can('promote_users')) {
            return false;
        }

        $user_rates = (array) get_user_meta($user->ID, 'special_prices', true);
        ?>
        <table class="form-table">
            <tr valign="top">
                <th scope="row" class="titledesc"><?php _e('User Price', 'user_price'); ?></th>
                <td class="forminp">
                    <table class="userprice widefat" cellspacing="0">
                        <thead>
                        <tr>
                            <th class="check-column"><input type="checkbox" name="select_all" /></th>
                            <th><?php _e('Product ID', 'user_price'); ?></th>
                            <th><?php _e('Price', 'user_price'); ?></th>
                            <th><?php _e('Price Suffix', 'user_price'); ?></th>
                        </tr>
                        </thead>
                        <tfoot>
                        <tr>
                            <th colspan="3"><a href="#" class="add_option button"><?php _e('+ Add Option', 'user_price'); ?></a></th>
                            <th><a href="#" class="remove button"><?php _e('Delete selected rows', 'user_price'); ?></a></th>
                        </tr>
                        </tfoot>
                        <tbody id="price_options">
                        <?php
                        $i = 0;
                        foreach ($user_rates as $user_rate) {
                            ?>
                            <tr class="price_option">
                                <td class="check-column"><input type="checkbox" style="margin: 0 0 0 8px;" name="select[<?php echo $i; ?>]" /></td>
                                <td class="p_id">
                                    <input type="text" class="text" value="<?php echo esc_attr($user_rate['item_number']); ?>" name="item_number[<?php echo $i; ?>]" title="<?php _e('Product ID', 'user_price'); ?>" size="16" />
                                </td>
                                <td class="price">
                                    <input type="text" class="text" value="<?php echo esc_attr($user_rate['price']); ?>" name="price[<?php echo $i; ?>]" title="<?php _e('Price', 'user_price'); ?>" size="16" />
                                </td>
                                <td class="price_suffix">
                                    <input type="text" class="text" value="<?php echo esc_attr($user_rate['price_suffix']); ?>" name="price_suffix[<?php echo $i; ?>]" title="<?php _e('Extra Price', 'user_price'); ?>" size="16" />
                                </td>
                            </tr>
                            <?php
                            $i++;
                        }
                        ?>
                        </tbody>
                    </table>
                </td>
            </tr>
        </table>
        <?php
    }

    public function update_extra_profile_fields($user_id) {
        $user_rate = array();
        $item_number = isset($_POST['item_number']) ? array_map('sanitize_text_field', $_POST['item_number']) : array();
        $price = isset($_POST['price']) ? array_map('sanitize_text_field', $_POST['price']) : array();
        $price_suffix = isset($_POST['price_suffix']) ? array_map('sanitize_text_field', $_POST['price_suffix']) : array();

        foreach ($price_suffix as $i => $val) {
            $user_rate[] = array(
                'item_number'   => $item_number[$i],
                'price'         => $price[$i],
                'price_suffix'  => $price_suffix[$i]
            );
        }

        update_user_meta($user_id, 'special_prices', $user_rate);
    }
}

new ISAAC_Price();