Google Fonts - Enqueue Font for WP Theme

function theme_slug_fonts_url() {
$fonts_url = '';

/* Translators: If there are characters in your language that are not
* supported by Lora, translate this to 'off'. Do not translate
* into your own language.
*/
$lora = _x( 'on', 'Lora font: on or off', 'theme-slug' );

/* Translators: If there are characters in your language that are not
* supported by Open Sans, translate this to 'off'. Do not translate
* into your own language.
*/
$open_sans = _x( 'on', 'Open Sans font: on or off', 'theme-slug' );

if ( 'off' !== $lora || 'off' !== $open_sans ) {
$font_families = array();

if ( 'off' !== $lora ) {
$font_families[] = 'Lora:400,700,400italic';
}

if ( 'off' !== $open_sans ) {
$font_families[] = 'Open Sans:700italic,400,800,600';
}

$query_args = array(
'family' => urlencode( implode( '|', $font_families ) ),
'subset' => urlencode( 'latin,latin-ext' ),
);

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

return esc_url_raw( $fonts_url );
}

====================== two method =======================



function google_fonts() {
    $query_args = array(
        'family' => 'Open+Sans:300,800|Philosopher:400,700',
        'subset' => 'latin,latin-ext'
    );
    wp_enqueue_style( 'google_fonts', add_query_arg( $query_args, "//fonts.googleapis.com/css" ), array(), null );
}
add_action('wp_enqueue_scripts', 'google_fonts');