WordPress
Conceptos básicos del personalizador (Agregar panel, Sección, Configuración, Control)

Añadir un panel de personalización

<?php
/**
 * Panel: WPCustomize
 *
 * Basic Customizer panel with basic controls.
 *
 * @since    1.0.0
 * @package  WPC
 */

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

// Customize function.
if ( ! function_exists( 'wpc_panel_wpcustomize' ) ) {
    // Customize Register action.
    add_action( 'customize_register', 'wpc_panel_wpcustomize' );
    /**
     * Customize Panel.
     *
     * Adds a Panel, Section with basic controls.
     *
     * @param  object WP_Customize $wp_customize Instance of the WP_Customize_Manager class.
     * @since  1.0.0
     */
    function wpc_panel_wpcustomize( $wp_customize ) {
        // Panel: Basic.
        $wp_customize->add_panel( 'wpc_panel_wpcustomize', array(
            'priority'       => 10,
            'title'          => __( 'WPCustomize Panel Title', 'WPC' ),
            'description'    => __( 'Panel Description', 'WPC' ),
            'capability'     => 'edit_theme_options'
        ) );
    }
}

Agregar una sección de personalizador con la configuración básica y sus controles

Los paneles pueden tener secciones, las secciones pueden tener configuraciones y las configuraciones pueden tener controles. Las configuraciones se guardan en la base de datos, mientras que los controles para configuraciones particulares solo se usan para mostrar su configuración correspondiente al usuario.

Este código crea una section básica en el panel desde arriba. Dentro hay unas cuantas settings básicas con controls adjuntos.

<?php
/**
 * Section: Basic
 *
 * Basic Customizer section with basic controls.
 *
 * @since     1.0.0
 * @package   WPC
 */

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

// Customize function.
if ( ! function_exists( 'wpc_customize_panel_basic' ) ) {
    // Customize Register action.
    add_action( 'customize_register', 'wpc_customize_panel_basic' );

    /**
     * Customize Panel.
     *
     * Adds a Panel, Section with basic controls.
     *
     * @param  object WP_Customize $wp_customize Instance of the WP_Customize_Manager class.
     * @since  1.0.0
     */
    function wpc_customize_panel_basic( $wp_customize ) {
        // Section: Basic.
        $wp_customize->add_section( 'wpc_section_basic', array(
            'priority'       => 10,
            'panel'          => 'wpc_panel_wpcustomize',
            'title'          => __( 'Basic Section Title', 'WPC' ),
            'description'    => __( 'Section Description.', 'WPC' ),
            'capability'     => 'edit_theme_options'
        ) );

        // Setting: Text.
        $wp_customize->add_setting( 'wpc_text', array(
            'type'                 => 'theme_mod',
            'default'              => 'Placeholder.',
            'transport'            => 'refresh', // Options: refresh or postMessage.
            'capability'           => 'edit_theme_options',
            'sanitize_callback'    => 'esc_attr'
        ) );

        // Control: Text.
        $wp_customize->add_control( 'wpc_text', array(
            'label'       => __( 'Text', 'WPC' ),
            'description' => __( 'Description', 'WPC' ),
            'section'     => 'wpc_section_basic',
            'type'        => 'text'
        ) );

        // Setting: Textarea.
        $wp_customize->add_setting( 'wpc_textarea', array(
            'type'                 => 'theme_mod',
            'default'              => 'Placeholder textarea.',
            'transport'            => 'refresh', // Options: refresh or postMessage.
            'capability'           => 'edit_theme_options',
            'sanitize_callback'    => 'exc_textarea'
        ) );

        // Control: Textarea.
        $wp_customize->add_control( 'wpc_textarea', array(
            'label'       => __( 'Textarea', 'WPC' ),
            'description' => __( 'Description', 'WPC' ),
            'section'     => 'wpc_section_basic',
            'type'        => 'textarea'
        ) );

        // Setting: Checkbox.
        $wp_customize->add_setting( 'wpc_checkbox', array(
            'type'                 => 'theme_mod',
            'default'              => 'enable',
            'transport'            => 'refresh', // Options: refresh or postMessage.
            'capability'           => 'edit_theme_options',
            'sanitize_callback'    => 'wpc_sanitize_checkbox' // Custom function in customizer-sanitization.php file.
        ) );

        // Control: Checkbox.
        $wp_customize->add_control( 'wpc_checkbox', array(
            'label'       => __( 'Checkbox', 'WPC' ),
            'description' => __( 'Description', 'WPC' ),
            'section'     => 'wpc_section_basic',
            'type'        => 'checkbox'
        ) );

        // Setting: Radio.
        $wp_customize->add_setting( 'wpc_radio', array(
            'type'                 => 'theme_mod',
            'default'              => 'on',
            'transport'            => 'refresh', // Options: refresh or postMessage.
            'capability'           => 'edit_theme_options',
            'sanitize_callback'    => 'wpc_sanitize_select', // Custom function in customizer-sanitization.php file.
        ) );

        // Control: Radio.
        $wp_customize->add_control( 'wpc_radio', array(
            'label'       => __( 'Radio', 'WPC' ),
            'description' => __( 'Description', 'WPC' ),
            'section'     => 'wpc_section_basic',
            'type'        => 'radio',
            'choices'  => array(
                'enable'  => 'Enable',
                'disable' => 'Disable'
            )
        ) );

        // Setting: Select.
        $wp_customize->add_setting( 'wpc_select', array(
            'type'                 => 'theme_mod',
            'default'              => 'enable',
            'transport'            => 'refresh', // Options: refresh or postMessage.
            'capability'           => 'edit_theme_options',
            'sanitize_callback'    => 'wpc_sanitize_select' // Custom function in customizer-sanitization.php file.
        ) );

        // Control: Select.
        $wp_customize->add_control( 'wpc_select', array(
            'label'       => __( 'Select', 'WPC' ),
            'description' => __( 'Description', 'WPC' ),
            'section'     => 'wpc_section_basic',
            'type'        => 'select',
            'choices'  => array(
                'enable'  => 'Enable',
                'disable' => 'Disable'
            )
        ) );
    }
}