Custom Customizer controls for Showcasing Chosen Category and Pages in WordPress

customizer.php

// Customizer controls

// Custom Control for Category Dropdown
if (class_exists('WP_Customize_Control')) {
    class WP_Customize_Category_Control extends WP_Customize_Control {
        /**
         * Render the control's content.
         *
         * @since 3.4.0
         */
        public function render_content() {
            $dropdown = wp_dropdown_categories(
                array(
                    'name'              => '_customize-dropdown-categories-' . $this->id,
                    'echo'              => 0,
                    'show_option_none'  => __( '— Select —' ),
                    'option_none_value' => '0',
                    'selected'          => $this->value(),
                )
            );

            // Hackily add in the data link parameter.
            $dropdown = str_replace( '<select', '<select ' . $this->get_link(), $dropdown );

            printf(
                '<label class="customize-control-select"><span class="customize-control-title">%s</span> %s</label>',
                $this->label,
                $dropdown
            );
        }
    }
}

function greene_customize_register( $wp_customize ) {
    $wp_customize->add_section( 'category_featured_section', array(
        'title'         => _('Featured Category', 'greene'),
        'description'   => _('Choose a category to highlight on the front page', 'greene')
    ) );

    $wp_customize->add_section( 'page_featured_section', array(
        'title'         => _('Featured Page', 'greene'),
        'description'   => _('Choose pages to highlight on the front page', 'greene')
    ));

    $wp_customize->add_setting( 'category_featured', array(
        'type'          => 'theme_mod',
        'capability'    => 'edit_theme_options',
        'default'       => 'volunteer-opportunities'
    ));

    $wp_customize->add_setting( 'category_featured_title', array(
        'type'          => 'theme_mod',
        'capability'    => 'edit_theme_options',
        'sanitize_callback' => 'sanitize_text_field'
    ));

    $wp_customize->add_setting( 'category_featured_button', array(
        'type'          => 'theme_mod',
        'capability'    => 'edit_theme_options',
        'sanitize_callback' => 'sanitize_text_field'
    ));

    for($count = 1; $count <=3; $count++) {
        $wp_customize->add_setting( 'page_featured-' . $count, array(
            'type'          => 'theme_mod',
            'capability'    => 'edit_theme_options'
        ));

        $wp_customize->add_setting( ' page_featured_title-' . $count, array(
            'type'          => 'theme_mod',
            'capability'    => 'edit_theme_option',
            'sanitize_callback' => 'sanitize_text_field'
        ));

        $wp_customize->add_setting( 'page_featured_button-' . $count, array(
            'type'          => 'theme_mod',
            'capability'    => 'edit_theme_options',
            'sanitize_callback' => 'sanitize_text_field'
        ));
    }

    $wp_customize->add_control(
        new WP_Customize_Category_Control(
            $wp_customize,
            'category_featured',
            array(
                'label'         => _('Featured Category', 'greene'),
                'section'       => 'category_featured_section'
            )
            )
        );

    $wp_customize->add_control('category_featured_title', array(
        'label'         => _('Display Title', 'greene'),
        'type'          => 'text',
        'section'       => 'category_featured_section'
    ));

    $wp_customise->add_control('category_featured_button', array(
        'label'         => _('Button Text', 'greene'),
        'type'          => 'text',
        'section'       => 'category_featured_section'
    ));

    for ($count = 1; $count <= 3; $count++ ) {
        $wp_customize->add_control('page_featured-' . $count, array(
            'label'         => _('Featured Page', 'greene'),
            'type'          => 'dropdown-pages',
            'section'       => 'page_featured_section'
        ));

        $wp_customize->add_control('page_featured_title-' . $count, array(
            'label'         => _('Display Title', 'greene'),
            'type'          => 'text',
            'section'       => 'page_featured_section'
        ));

        $wp_customize->add_control('page_featured_button-' . $count, array(
            'label'         => _('Button Text', 'greene'),
            'type'          => 'text',
            'section'       => 'page_featured_section'
        ));
    }
}

add_action( 'customize_register', 'greene_customize_register');