Google Font select for WordPress Customizer

customizer.php

<?php
new theme_customizer();

class theme_customizer {
	public function __construct() {
		add_action( 'customize_register', array(&$this, 'customize_linje' ));
	}

	/**
	 * Customizer manager demo
	 * @param  WP_Customizer_Manager $wp_manager
	 * @return void
	 */
	public function customize_linje( $wp_manager ) {
		$this->linje_fonts_sections( $wp_manager );
	}

	private function linje_fonts_sections( $wp_manager ) {
		$wp_manager->add_section( 'linje_google_fonts_section', array(
			'title'       => __( 'Google Fonts', 'linje' ),
			'priority'       => 24,
		) );

		$font_choices = array(
			'Source Sans Pro:400,700,400italic,700italic' => 'Source Sans Pro',
			'Open Sans:400italic,700italic,400,700' => 'Open Sans',
			'Oswald:400,700' => 'Oswald',
			'Playfair Display:400,700,400italic' => 'Playfair Display',
			'Montserrat:400,700' => 'Montserrat',
			'Raleway:400,700' => 'Raleway',
			'Droid Sans:400,700' => 'Droid Sans',
			'Lato:400,700,400italic,700italic' => 'Lato',
			'Arvo:400,700,400italic,700italic' => 'Arvo',
			'Lora:400,700,400italic,700italic' => 'Lora',
			'Merriweather:400,300italic,300,400italic,700,700italic' => 'Merriweather',
			'Oxygen:400,300,700' => 'Oxygen',
			'PT Serif:400,700' => 'PT Serif',
			'PT Sans:400,700,400italic,700italic' => 'PT Sans',
			'PT Sans Narrow:400,700' => 'PT Sans Narrow',
			'Cabin:400,700,400italic' => 'Cabin',
			'Fjalla One:400' => 'Fjalla One',
			'Francois One:400' => 'Francois One',
			'Josefin Sans:400,300,600,700' => 'Josefin Sans',
			'Libre Baskerville:400,400italic,700' => 'Libre Baskerville',
			'Arimo:400,700,400italic,700italic' => 'Arimo',
			'Ubuntu:400,700,400italic,700italic' => 'Ubuntu',
			'Bitter:400,700,400italic' => 'Bitter',
			'Droid Serif:400,700,400italic,700italic' => 'Droid Serif',
			'Roboto:400,400italic,700,700italic' => 'Roboto',
			'Open Sans Condensed:700,300italic,300' => 'Open Sans Condensed',
			'Roboto Condensed:400italic,700italic,400,700' => 'Roboto Condensed',
			'Roboto Slab:400,700' => 'Roboto Slab',
			'Yanone Kaffeesatz:400,700' => 'Yanone Kaffeesatz',
			'Rokkitt:400' => 'Rokkitt',
		);

		$wp_manager->add_setting( 'linje_headings_fonts', array(
				'sanitize_callback' => 'linje_sanitize_fonts',
			)
		);

		$wp_manager->add_control( 'linje_headings_fonts', array(
				'type' => 'select',
				'description' => __('Select your desired font for the headings.', 'linje'),
				'section' => 'linje_google_fonts_section',
				'choices' => $font_choices
			)
		);

		$wp_manager->add_setting( 'linje_body_fonts', array(
				'sanitize_callback' => 'linje_sanitize_fonts'
			)
		);

		$wp_manager->add_control( 'linje_body_fonts', array(
				'type' => 'select',
				'description' => __( 'Select your desired font for the body.', 'linje' ),
				'section' => 'linje_google_fonts_section',
				'choices' => $font_choices
			)
		);
	}
}

// Setup the Theme Customizer settings and controls...
//add_action( 'customize_register', array( 'theme_customizer', 'customize_linje' ) );

// Output custom CSS to live site
add_action( 'wp_head', array( 'theme_customizer' ) );

functions.php

<?php

/**
 * Enqueue scripts and styles.
 */
function linje_scripts() {
	$headings_font = esc_html(get_theme_mod('linje_headings_fonts'));
	$body_font = esc_html(get_theme_mod('linje_body_fonts'));

	if( $headings_font ) {
		wp_enqueue_style( 'linje-headings-fonts', '//fonts.googleapis.com/css?family='. $headings_font );
	} else {
		wp_enqueue_style( 'linje-source-sans', '//fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic');
	}
	if( $body_font ) {
		wp_enqueue_style( 'linje-body-fonts', '//fonts.googleapis.com/css?family='. $body_font );
	} else {
		wp_enqueue_style( 'linje-source-body', '//fonts.googleapis.com/css?family=Source+Sans+Pro:400,300,400italic,700,600');
	}
}
add_action( 'wp_enqueue_scripts', 'linje_scripts' );

/**
 * Google Fonts
 */
require get_template_directory() . '/inc/gfonts.php';

gfonts.php

<?php

/*
 * Props to the BLDR Theme: https://wordpress.org/themes/bldr/
 * */

function linje_custom_styles($custom) {


	//Fonts

	$headings_font = esc_html(get_theme_mod('linje_headings_fonts'));

	$body_font = esc_html(get_theme_mod('linje_body_fonts'));



	if ( $headings_font ) {

		$font_pieces = explode(":", $headings_font);

		$custom .= "h1, h2, h3, h4, h5, h6 { font-family: {$font_pieces[0]}; }"."\n";

	}

	if ( $body_font ) {

		$font_pieces = explode(":", $body_font);

		$custom .= "body, button, input, select, textarea { font-family: {$font_pieces[0]}; }"."\n";

	}

	//Output all the styles

	wp_add_inline_style( 'linje-css', $custom );

}

add_action( 'wp_enqueue_scripts', 'linje_custom_styles' );



//Sanitizes Fonts
function linje_sanitize_fonts( $input ) {
	$valid = array(
		'Source Sans Pro:400,700,400italic,700italic' => 'Source Sans Pro',
		'Open Sans:400italic,700italic,400,700' => 'Open Sans',
		'Oswald:400,700' => 'Oswald',
		'Playfair Display:400,700,400italic' => 'Playfair Display',
		'Montserrat:400,700' => 'Montserrat',
		'Raleway:400,700' => 'Raleway',
		'Droid Sans:400,700' => 'Droid Sans',
		'Lato:400,700,400italic,700italic' => 'Lato',
		'Arvo:400,700,400italic,700italic' => 'Arvo',
		'Lora:400,700,400italic,700italic' => 'Lora',
		'Merriweather:400,300italic,300,400italic,700,700italic' => 'Merriweather',
		'Oxygen:400,300,700' => 'Oxygen',
		'PT Serif:400,700' => 'PT Serif',
		'PT Sans:400,700,400italic,700italic' => 'PT Sans',
		'PT Sans Narrow:400,700' => 'PT Sans Narrow',
		'Cabin:400,700,400italic' => 'Cabin',
		'Fjalla One:400' => 'Fjalla One',
		'Francois One:400' => 'Francois One',
		'Josefin Sans:400,300,600,700' => 'Josefin Sans',
		'Libre Baskerville:400,400italic,700' => 'Libre Baskerville',
		'Arimo:400,700,400italic,700italic' => 'Arimo',
		'Ubuntu:400,700,400italic,700italic' => 'Ubuntu',
		'Bitter:400,700,400italic' => 'Bitter',
		'Droid Serif:400,700,400italic,700italic' => 'Droid Serif',
		'Roboto:400,400italic,700,700italic' => 'Roboto',
		'Open Sans Condensed:700,300italic,300' => 'Open Sans Condensed',
		'Roboto Condensed:400italic,700italic,400,700' => 'Roboto Condensed',
		'Roboto Slab:400,700' => 'Roboto Slab',
		'Yanone Kaffeesatz:400,700' => 'Yanone Kaffeesatz',
		'Rokkitt:400' => 'Rokkitt',
	);

	if ( array_key_exists( $input, $valid ) ) {
		return $input;
	} else {
		return '';
	}
}