Register/enqueue Google fonts in WordPress Theme.

google-fonts-in-wp-theme.php

<?php
/**
 * Register/enqueue Google fonts in WordPress Theme
 * 
 * Note:
 * 1. Change `theme_slug` with your theme slug.
 * 2. Change `theme-slug` with your theme slug.
 * 3. Change `textdomain` with your theme textdomain.
 */

if ( ! function_exists( 'theme_slug_scripts' ) ) :

	/**
	 * Enqueue scripts and styles.
	 */
	function theme_slug_scripts()
	{
		wp_enqueue_style( 'theme-slug-fonts', theme_slug_google_fonts_url(), array(), null );
	}
	add_action( 'wp_enqueue_scripts', 'theme_slug_scripts' );

endif;

if ( ! function_exists( 'theme_slug_google_fonts_url' ) ) :

	/**
	 * Register Google fonts
	 *
	 * @return string Google fonts URL for the theme.
	 */
	function theme_slug_google_fonts_url() {
		$fonts_url = '';
		$fonts     = array();
		$subsets   = 'latin,latin-ext';

		/* translators: If there are characters in your language that are not supported by Josefin Slab, translate this to 'off'. Do not translate into your own language. */
		if ( 'off' !== _x( 'on', 'Josefin Slab font: on or off', 'textdomain' ) ) {
			$fonts[] = 'Josefin Slab:400,600,700';
		}

		/* translators: If there are characters in your language that are not supported by Lato, translate this to 'off'. Do not translate into your own language. */
		if ( 'off' !== _x( 'on', 'Lato font: on or off', 'textdomain' ) ) {
			$fonts[] = 'Lato:400,700';
		}

		$query_args = array(
			'family' => urlencode( implode( '|', $fonts ) ),
			'subset' => urlencode( $subsets ),
		);

		if ( $fonts ) {
			$fonts_url = add_query_arg( $query_args, 'https://fonts.googleapis.com/css' );
		}

		return esc_url_raw( $fonts_url );
	}

endif;