<?php

if (!isset($args)) {
    $context = 'header';
} elseif (count($args) == 0) {
    $context = 'header';
} else {
    $context = $args['context'];
}
$image = get_theme_mod('logo_upload');
$display = get_theme_mod('logo_display');
if ($display == '') {
    $display = 'header';
}

if ($image && ($context == $display || $display == 'both')) {
    $image_alt = get_post_meta(attachment_url_to_postid($image), '_wp_attachment_image_alt', true);
    if (empty($image_alt)) {
        $image_alt = get_bloginfo('name');
    }
    $logo = "<span class='screen-reader-text'>" . esc_html(get_bloginfo('name')) . "</span><img class='logo' src='" . esc_url(get_theme_mod('logo_upload')) . "' alt='" . esc_attr($image_alt) . "' />";
} else {
    $logo = esc_html(get_bloginfo('name'));
}

$output = "<div id='site-title' class='site-title'>";
$output .= "<a href='" . esc_url(home_url()) . "'>";
$output .= $logo;
$output .= "</a>";
$output .= "</div>";

echo $output;