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Filename : metabox-settings.php
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<?php

class infopediyaMetaboxSettings
{

    private $screens = array('post');

    private $fields = array(

        array(
            'label' => '',
            'id' => 'infopediya_meta_show_star_ratting',
            'type' => 'select',
            'options' => array(
                'Show all rattings',
                'Hide rattings - top',
                'Hide rattings - bottom',
                'Hide all rattings',
            ),
        ),
    );

    public function __construct()
    {
        add_action('add_meta_boxes', array($this, 'add_meta_boxes'));
        add_action('save_post', array($this, 'save_fields'));
    }

    public function add_meta_boxes()
    {
        foreach ($this->screens as $s) {
            add_meta_box(
                'infopediya_show_stars',
                __('Show Star ratting', 'infopediya'),
                array($this, 'meta_box_callback_star'),
                $s,
               
            );
        }
    }

    public function meta_box_callback_star($post)
    {
        wp_nonce_field('infopediya_star_data', 'infopediya_star_nonce');
        echo "Display rattings on your article";
        $this->field_generator_star($post);
    }

    public function field_generator_star($post)
    {
        $output = '';
        foreach ($this->fields as $field) {
            $label = '<label for="' . $field['id'] . '">' . $field['label'] . '</label>';
            $meta_value = get_post_meta($post->ID, $field['id'], true);
            if (empty($meta_value)) {
                if (isset($field['default'])) {
                    $meta_value = $field['default'];
                }
            }
            switch ($field['type']) {
                case 'select':
                    $input = sprintf(
                        '<select id="%s" name="%s">',
                        $field['id'],
                        $field['id']
                    );
                    foreach ($field['options'] as $key => $value) {
                        $field_value = !is_numeric($key) ? $key : $value;
                        $input .= sprintf(
                            '<option %s value="%s">%s</option>',
                            $meta_value === $field_value ? 'selected' : '',
                            $field_value,
                            $value
                        );
                    }
                    $input .= '</select>';
                    break;

                default:
                    $input = sprintf(
                        '<input %s id="%s" name="%s" type="%s" value="%s">',
                        $field['type'] !== 'color' ? 'style="width: 50%"' : '',
                        $field['id'],
                        $field['id'],
                        $field['type'],
                        $meta_value
                    );
            }
            $output .= $this->format_rows($label, $input);
        }
        echo '<table class="form-table"><tbody>' . $output . '</tbody></table>';
    }

    public function format_rows($label, $input)
    {
        return '<div style="margin-top: 10px;"><strong>' . $label . '</strong></div><div>' . $input . '</div>';
    }


    public function save_fields($post_id)
    {
        if (!isset($_POST['infopediya_star_nonce'])) {
            return $post_id;
        }
        $nonce = $_POST['infopediya_star_nonce'];
        if (!wp_verify_nonce($nonce, 'infopediya_star_data')) {
            return $post_id;
        }
        if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
            return $post_id;
        }
        foreach ($this->fields as $field) {
            if (isset($_POST[$field['id']])) {
                switch ($field['type']) {
                    case 'email':
                        $_POST[$field['id']] = sanitize_email($_POST[$field['id']]);
                        break;
                    case 'text':
                        $_POST[$field['id']] = sanitize_text_field($_POST[$field['id']]);
                        break;
                }
                update_post_meta($post_id, $field['id'], $_POST[$field['id']]);
            } else if ($field['type'] === 'checkbox') {
                update_post_meta($post_id, $field['id'], '0');
            }
        }
    }

}

if (class_exists('infopediyaMetaboxSettings')) {
    new infopediyaMetaboxSettings;
}