WP Customizer / Custom Controls / Sanitization

control.php

<?php

class litho_textarea_control extends WP_Customize_Control {

	public $type = 'textarea';

	public function render_content() { ?>
		<label>
			<span class="customize-control-title"><?php echo esc_html( $this->label ); ?></span>
			<textarea rows="5" style="width:100%;" <?php $this->link(); ?>><?php echo esc_textarea( $this->value() ); ?></textarea>
		</label>
	<?php }
}

class litho_slider_control extends WP_Customize_Control {

	public $type = 'slider';

	public function render_content() { ?>
		<label>
			<span class="customize-control-title"><?php echo esc_html( $this->label ); ?></span>
			<div id="slider">
				<input id="slide" type="range" min="1" max="100" step="1" value="<?php echo esc_attr($this->value()); ?>" onchange="updateSlider(<?php $this->link(); checked( $this->value() ); ?>)" <?php $this->link(); ?> />
			</div>
		</label>
	<?php }
}

class litho_toggle_control extends WP_Customize_Control {

	public $type = 'toggle';

	public function render_content() { ?>
		<label>
			<input type="checkbox" class="ios-switch" value="<?php echo esc_attr($this->value()); ?>"
			<?php $this->link(); checked( $this->value() ); ?> />
			<div class="switch"></div>
			<?php echo esc_html( $this->label ); ?>
		</label>
	<?php }
}

customizer.php

<?php


/** Adds the Customize page to the WordPress admin area */
function litho_customizer_menu() {
    add_theme_page( 'Customize', 'Customize', 'edit_theme_options', 'customize.php' );
}
add_action( 'admin_menu', 'litho_customizer_menu' );

/** Adds the individual sections, settings, and controls to the theme customizer */
function litho_customizer( $wp_customize ) {
	
	if (class_exists('WP_Customize_Control')) {
		include_once('control.php');
	}
	
	$this->add_section( 'header_image', array('title' => __( 'Site Header' ),'theme_supports' => 'custom-header','priority' => 1 ));
	$this->add_section( 'title_tagline', array('title' => __( 'Labels' ),'priority' => 2 ));
	$this->add_section( 'colors', array('title' => __( 'Colors' ),'priority' => 40 ));
	$this->add_section( 'background_image', array('title' => __( 'Background Image' ),'theme_supports' => 'custom-background','priority' => 80 ));
	$this->add_section( 'nav', array('title' => __( 'Navigation' ),'theme_supports' => 'menus','priority' => 100,'description' => sprintf( _n('Your theme supports %s menu. Select which menu you would like to use.', 'Your theme supports %s menus. Select which menu appears in each location.', $num_locations ), number_format_i18n( $num_locations ) ) . "\n\n" . __('You can edit your menu content on the Menus screen in the Appearance section.') ));
	$this->add_section( 'static_front_page', array('title' => __( 'Static Front Page' ),'priority' => 120,'description' => __( 'Your theme supports a static front page.' ) ));

	$wp_customize->add_setting( 'litho_logo' );
	$wp_customize->add_control( new WP_Customize_Image_Control( $wp_customize, 'litho_logo',array(
		'label' => 'Site Logo',
		'section' => 'header_image',
		'settings' => 'litho_logo'
	)));
	
	$wp_customize->add_setting( 'litho_header_height' );
	$wp_customize->add_control( 'litho_header_height',array(
		'type' => 'slider',
		'label' => 'Header Height',
		'section' => 'header_image'
	));

	$wp_customize->add_setting( 'litho_logo_position', array( 'default' => 'left','sanitize_callback' => 'litho_sanitize_position', ) );	
	$wp_customize->add_control( 'litho_logo_position',array(
		'type' => 'radio',
		'label' => 'Logo Position',
		'section' => 'header_image',
		'choices' => array( 'left' => 'left','right' => 'right','center' => 'center')
	));

	$wp_customize->add_setting( 'litho_subtitle', array( 'default' => 'Default subtitle text','sanitize_callback' => 'litho_sanitize_text', ) );
	$wp_customize->add_control('litho_subtitle', array(
		'label' => 'Site Subtitle',
		'section' => 'header_image',
		'type' => 'text'
	));

	$wp_customize->add_setting( 'litho_subtitle_position', array( 'default' => 'left','sanitize_callback' => 'litho_sanitize_position', ) );
	$wp_customize->add_control( 'litho_subtitle_position',array(
		'type' => 'radio',
		'label' => 'Subtitle Position',
		'section' => 'header_image',
		'choices' => array( 'left' => 'Left','right' => 'Right','center' => 'Center')
	));
	
	$wp_customize->add_setting( 'litho_subtitle_bgcolor', array( 'default' => '#000000','sanitize_callback' => 'sanitize_hex_color', ) );
	$wp_customize->add_control( new WP_Customize_Color_Control( $wp_customize, 'litho_subtitle_bgcolor',array(
			'label' => 'Subtitle Background Color',
			'section' => 'header_image',
			'settings' => 'litho_subtitle_bgcolor'
	)));
	
	$wp_customize->add_section( 'litho_site_settings', array('title' => 'Framework Settings','description' => 'Adjust settings','priority' => 35));
	$wp_customize->add_section( 'site_settings', array('title' => 'Header','description' => 'Adjust settings','priority' => 35));

	$wp_customize->add_setting( 'litho_copyright_textbox',array( 'default' => 'Company name','sanitize_callback' => 'litho_sanitize_text', ) );
	$wp_customize->add_control( 'litho_copyright_textbox',array(
			'label' => 'Copyright text',
			'section' => 'litho_site_settings',
			'type' => 'text'
	));
	
	$wp_customize->add_setting( 'litho_logo_position', array( 'default' => 'left','sanitize_callback' => 'litho_sanitize_position', ) );
	$wp_customize->add_control( 'litho_logo_position',array(
			'type' => 'radio',
			'label' => 'Logo placement',
			'section' => 'litho_site_settings',
			'choices' => array( 'left' => 'Left','right' => 'Right','center' => 'Center')
	));
	
	$wp_customize->add_setting( 'litho_powered_by', array( 'default' => 'wordpress','sanitize_callback' => 'litho_sanitize_powered_by', ) );
	$wp_customize->add_control( 'litho_powered_by',array(
			'type' => 'select',
			'label' => 'This site is powered by:',
			'section' => 'litho_site_settings',
			'choices' => array( 'wordpress' => 'WordPress','nuclear-energy' => 'Nuclear Energy')
	));
	
	$wp_customize->add_setting( 'page-setting', array( 'sanitize_callback' => 'litho_sanitize_integer', ) );
	$wp_customize->add_control( 'page-setting',array(
			'type' => 'dropdown-pages',
			'label' => 'Choose a page:',
			'section' => 'litho_site_settings'
	));
	
	$wp_customize->add_setting( 'color-setting', array( 'default' => '#000000','sanitize_callback' => 'sanitize_hex_color', ) );
	$wp_customize->add_control( new WP_Customize_Color_Control( $wp_customize, 'color-setting',array(
			'label' => 'Color Setting',
			'section' => 'litho_site_settings',
			'settings' => 'color-setting'
	)));
	
	$wp_customize->add_setting( 'file-upload' );
	$wp_customize->add_control( new WP_Customize_Upload_Control( $wp_customize, 'file-upload',array(
			'label' => 'File Upload',
			'section' => 'litho_site_settings',
			'settings' => 'file-upload'
	)));
	
	$wp_customize->add_setting( 'textarea' );
	$wp_customize->add_control( new Example_Customize_Textarea_Control( $wp_customize, 'textarea',array(
			'label' => 'Textarea',
			'section' => 'litho_site_settings',
			'settings' => 'textarea'
	)));
	
	$wp_customize->add_setting( 'font-color', array( 'default' => '#444444', 'sanitize_callback' => 'sanitize_hex_color', ));
	$wp_customize->add_control( new WP_Customize_Color_Control( $wp_customize, 'font-color',array(
			'label' => 'Font Color',
			'section' => 'colors',
			'settings' => 'font-color'
	)));

	$wp_customize->add_setting( 'featured-background',array( 'default' => '#ffffff','sanitize_callback' => 'sanitize_hex_color','transport' => 'postMessage', ));
	$wp_customize->add_control( new WP_Customize_Color_Control( $wp_customize,'featured-background',array(
			'label' => 'Featured Background',
			'section' => 'colors',
			'settings' => 'featured-background'
	)));
	
	/* AJAX function for live preview */
	if ( $wp_customize->is_preview() && ! is_admin() ) {
	    add_action( 'wp_footer', 'litho_customize_preview', 21);
	}
	
	function litho_customize_preview() {
		wp_enqueue_script( 'litho-customize-js', get_template_directory_uri().'/core/js/customize.js',array());
	}
	add_action( 'wp_enqueue_scripts', 'litho_customize_preview' );
	
	$wp_customize->get_setting('blogname')->transport='postMessage';
}
add_action( 'customize_register', 'litho_customizer' );

function litho_header_alignment() {
	$litho_position = get_theme_mod( 'litho_logo_position' );
	if( $litho_position != '' ) {
		switch ( $litho_position ) {
			case 'left':
				break;
			case 'right':
				echo '<style type="text/css">';
				echo '#header #logo{ float: right; }';
				echo '</style>';
				break;
			case 'center':
				echo '<style type="text/css">';
				echo '#header{ text-align: center; }';
				echo '#header #logo{ float: none; margin-left: auto; margin-right: auto; }';
				echo '</style>';
				break;
		}
	}
}
add_action ( 'wp_head','litho_header_alignment' );

include_once('sanitize.php'); /* Validate user input */

sanitize.php

<?php

function litho_sanitize_text( $input ) {
	return wp_kses_post( force_balance_tags( $input ) );
}
function litho_sanitize_checkbox( $input ) {
	if ( $input == 1 ) {
		return 1;
	} else {
		return '';
	}
}
function litho_sanitize_position( $input ) {
	$valid = array(
		'left' => 'Left',
		'right' => 'Right',
		'center' => 'Center',
	);
	
	if ( array_key_exists( $input, $valid ) ) {
		return $input;
	} else {
		return '';
	}
}

function litho_sanitize_powered_by( $input ) {
	$valid = array(
		'wordpress' => 'WordPress',
		'nuclear-energy' => 'Nuclear Energy',
	);
	
	if ( array_key_exists( $input, $valid ) ) {
		return $input;
	} else {
		return '';
	}
}
function litho_sanitize_integer( $input ) {
	if( is_numeric( $input ) ) {
		return intval( $input );
	}
}