WordPress - Return all post meta values in flat array

getAllPostMeta.php

<?php
// Return all meta for a single post in a flat array.
function get_all_post_meta($post_id) {
	// Get all the meta values.
	$meta = get_post_meta($post_id, '');

	// We only need the first item - return a flat array.
	return array_map(function($item) {
		return $item[0];
	}, $meta);
}

I added the code to remove service fields, like "_edit_lock":
`<?php
function get_all_post_meta($post_id) {
// Get all the meta values.
$meta = get_post_meta($post_id, '');

// We only need the first item - return a flat array.
$flat_meta =  array_map(function($item) {
	return $item[0];
}, $meta);

return array_filter($flat_meta, function ($key){
	return substr($key, 0, 1) !== '_';
}, ARRAY_FILTER_USE_KEY);

}
`