Wordpress 5.0+ breaks custom field saving - php

Question

Sorry about the code format, CTRL+K is said to move things 4 spaces. But it doesnt work in Chrome:(
Update: Amazing, I tried this 4 times. EAch time it triggered a Chrome Shortcut. I gave up and submitted this. It gave an error saying that I had code and did not properly format it. Then amazingly, Ctrl+K works. Not sure why this is so hard...
ANYWAYS,
I upgraded to WP 5.0 on a customer site and now all of the custom fields do not save.... I was using custom code and now the fields do not show in wordpress. It seems that everything I try today is not working. StackOverflow is now the latest to join this...
Id appreciate some help with this if anyone can read the last result.
-------------------------
$meta_box = array(
'id' => 'tunebot-meta-marketing-box',
'title' => 'Enable Marketing Links?',
'page' => 'page',
'context' => 'normal',
'priority' => 'high',
'fields' => array(
array(
'name' => 'Hide Title?',
'id' => 'tunebot_hide_titler',
'type' => 'checkbox'
),
array(
'name' => 'Display Image?',
'id' => 'tunebot_display_image',
'type' => 'checkbox'
),
array(
'name' => 'Enable Top Banner?',
'id' => 'tunebot_banner',
'type' => 'checkbox'
),
array(
'name' => 'Enable Marketing Links?',
'id' => 'tunebot_marketing_links',
'type' => 'checkbox'
),
)
);
add_action('admin_init', 'tunebot_add_box');
// Add meta box
function tunebot_add_box() {
global $meta_box;
add_action('post_submitbox_misc_actions', 'tunebot_show_box');
//add_meta_box($meta_box['id'], $meta_box['title'], 'tunebot_show_box', $meta_box['page'], $meta_box['context'], $meta_box['priority']);
}
/**
* Shows a box with options bellow it, under the text of the body.
*/
function tunebot_show_box() {
global $meta_box, $post;
// Use nonce for verification
$output = '<input type="hidden" name="tunebot_meta_box_nonce" value="' . wp_create_nonce(basename(__FILE__)) . '"/>';
foreach($meta_box['fields'] as $field) {
// get current post meta data
$postId = $post->ID;
$key = 'tb_' . $field['id'];
$meta = get_post_meta($postId, $field['id'], TRUE);
$output .= '<div class="misc-pub-section misc-pub-section-last">';
switch($field['type']) {
case 'text':
$output .= '<input type="text" name="' . $key . '" id="' . $key . '"
value="' . $meta ? $meta : $field['std'] . '" size="30" style="width:97%"/>' . '<br/>' .
$field['desc'];
break;
case 'textarea':
$output .= '<textarea name="' . $key . '" id="' . $key . '" cols="60" rows="4"
style="width:97%">' . $meta ? $meta : $field['std'] . '</textarea>' . '<br/>' .
$field['desc'];
break;
case 'select':
$output .= '<select name="' . $key . '" id="' . $key . '">';
foreach($field['options'] as $option) {
$output .= '
<option
' . $meta == $option ? ' selected="selected"' : '' . '>' . $option . '</option>';
}
$output .= '</select>';
break;
case 'radio':
foreach($field['options'] as $option) {
$output .= '<input type="radio" name="' . $key . '" value="' . $option['value'] . '"' . (($meta == $option['value']) ? ' checked="checked"' : '' . ' />' . $option['name']);
}
break;
case 'checkbox':
$output .= '<input type="checkbox" name="' . $key . '" id="' . $key . '"' . ($meta == "on" ? ' checked="checked"' : '') . ' />';
break;
}
$output .= '<label for="' . $key . '">' . $field['name'] . '</label></div>';
}
echo $output;
}
add_action('save_post', 'tunebot_save_data');
function tunebot_save_data($post_id) {
global $meta_box;
// verify nonce
if(isset($_POST['tunebot_meta_box_nonce']) && !wp_verify_nonce($_POST['tunebot_meta_box_nonce'], basename(__FILE__))) {
return $post_id;
}
// check autosave
if(defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
return $post_id;
}
// check permissions
if(isset($_POST['post_type']) && 'page' == $_POST['post_type']) {
if(!current_user_can('edit_page', $post_id)) {
return $post_id;
}
} elseif(!current_user_can('edit_post', $post_id)) {
return $post_id;
}
foreach($meta_box['fields'] as $field) {
if(isset($field['id'])) {
$key = 'tb_' . $field['id'];
if(isset($_POST[$key])) {
$new = $_POST[$key];
} else {
$new = FALSE;
}
$old = get_post_meta($post_id, $field['id'], TRUE);
if($new && $new != $old) {
update_post_meta($post_id, $field['id'], $new);
} elseif('' == $new && $old) {
delete_post_meta($post_id, $field['id'], $old);
}
}
}
return $post_id;
}