Place custom field data in header section - wordpress

Question

I'm a newbie to the Wordpress Customization and learning plugin development from a YouTube videos.
Below is the code snippet from my custom plugin that adds the two custom fields meta_title and meta_description in the example create/ edit form.
function ideapro_custom_posttype() {
register_post_type( 'Example',
array(
'labels'=>array(
'name' =>__('Examples'),
'singular_name' => __('Example'),
'add_new' => __('Add New Example'),
'add_new_item' => __('Add New Example'),
'edit_item' => __('Edit Example'),
'search_items' => __('Search Examples')
),
'menu_postion' => 5,
'public' =>true,
'exclude_from_search' => true,
'has_archives'=>false,
'register_meta_box_cb' => 'metaField_metabox',
'supports' => array('title', 'editor', 'thumbnail')
)
);
}
/** Add new custom fields to create post form*/
function metaField_metabox() {
add_meta_box( 'meta_fields', 'Meta Fields', 'display_metaFields', 'example','normal','high' );
}
function display_metaFields(){
global $post;
$meta_title = get_post_meta($post->ID,'meta_title', true);
$meta_description = get_post_meta($post->ID,'meta_description', true);
?>
<label>Meta Title</label>
<input type="text" name="meta_title" placeholder="Meta Title" class="widefat" value="<?php print $meta_title?>">
</br>
</br>
<label>Meta Description</label>
<input type="text" name="meta_description" placeholder="Meta Description"class="widefat" value="<?php print $meta_description?>">
<?php
}
add_action( 'add_meta_box','metaField_metabox' );
/** save custom field data to posts table */
function saveMetaFields($post_id){
$is_autosave = wp_is_post_autosave($post_id );
$is_revision = wp_is_post_revision( $post_id );
if( $is_autosave || $is_revision){
return;
}
$post = get_post($post_id);
if ($post->post_type == "example") {
if (array_key_exists('meta_title', $_POST)) {
update_post_meta( $post_id, 'meta_title',$_POST['meta_title']);
}
if (array_key_exists('meta_description', $_POST)) {
update_post_meta( $post_id, 'meta_description',$_POST['meta_description']);
}
}
}
add_action( 'save_post','saveMetaFields' );
With the above code I'm successful to add custom field data in the posts table.
Now I want to place the meta_title and meta_description of a each post in the header section of a post. Like:
<meta name="title">....</title>
<meta name="description">....</title>

Answer 1

Use wp_head action:
function myAction() {
if(is_single('Example'):
$postID = get_the_ID();
$title = get_post_meta($postID,'meta_title',true);
$desc = get_post_meta($postID,'meta_description',true);
?>
<meta name="title" content="<?php echo $title; ?>" />
<meta name="description" content="<?php echo $desc; ?>"/>
<?php
endif;
}
add_action( 'wp_head', 'myAction' );