Fonts

<?php

$invxtassy_body_font_get = cs_get_option('body_font');
$invxtassy_heading_font_get = cs_get_option('heading_font');

function invxtassy_body_gf_url() {
    $font_url = '';
    $invxtassy_body_font_get = cs_get_option('body_font');
    /*
    Translators: If there are characters in your language that are not supported
    by chosen font(s), translate this to 'off'. Do not translate into your own language.
     */

    if ( 'off' !== _x( 'on', 'Google font: on or off', 'invxtassy' ) ) {
        $font_url = add_query_arg( 'family', urlencode( ''.$invxtassy_body_font_get['family'].':300,300i,400,400i,500,500i,600,600i,700,700i,900,900i&subset=latin,latin-ext' ), "//fonts.googleapis.com/css" );
    }
    return $font_url;
}

if($invxtassy_heading_font_get['family'] == $invxtassy_body_font_get['family']) {} else {
    function invxtassy_heading_gf_url() {
        $font_url = '';
        $invxtassy_heading_font_get = cs_get_option('heading_font');
        /*
        Translators: If there are characters in your language that are not supported
        by chosen font(s), translate this to 'off'. Do not translate into your own language.
         */

        if ( 'off' !== _x( 'on', 'Google font: on or off', 'invxtassy' ) ) {
            $font_url = add_query_arg( 'family', urlencode( ''.$invxtassy_heading_font_get['family'].':300,300i,400,400i,500,500i,600,600i,700,700i,900,900i&subset=latin,latin-ext' ), "//fonts.googleapis.com/css" );
        }
        return $font_url;
    }
}

function invxtassy_options_gf() {
    wp_enqueue_style( 'invxtassy-custom-google-fonts', invxtassy_body_gf_url(), array(), '1.0.0' );

    $invxtassy_body_font_get = cs_get_option('body_font');
    $invxtassy_heading_font_get = cs_get_option('heading_font');
    if($invxtassy_heading_font_get['family'] == $invxtassy_body_font_get['family']) {} else {
        wp_enqueue_style( 'invxtassy-google-heading-fonts', invxtassy_heading_gf_url(), array(), '1.0.0' );
    }
}
add_action( 'wp_enqueue_scripts', 'invxtassy_options_gf' );


I used Codestar framework to select font family & weight.


	$body_font = cs_get_option('body_font');
	$heading_font = cs_get_option('heading_font');


        if (!empty($body_font)) {
			$custom_css .= "
				body{
					font-family: {$body_font['family']};
					font-weight: {$body_font['variant']};
				}
			";
		}

        if (!empty($heading_font)) {
			$custom_css .= "
				h1, h2, h3, h4, h5, h6{
					font-family: {$heading_font['family']};
					font-weight: {$heading_font['variant']};
				}
			";
		}