Get Post Meta
If you want to get all post meta, you can use the snippet below:
function get_post_meta_all( $post_id ) {
global $wpdb;
$data = array();
$wpdb->query( "SELECT `meta_key`, `meta_value` FROM $wpdb->postmeta WHERE `post_id` = $post_id" );
foreach ( $wpdb->last_result as $k => $v ) {
$data[ $v->meta_key ] = $v->meta_value;
};
return $data;
}