_wp_get_allowed_postdata() │ WP 5.0.1

Returns only allowed post data fields.

Internal function — this function is designed to be used by the kernel itself. It is not recommended to use this function in your code.

No Hooks.

Returns

Array|WP_Error. Array of post data on success, WP_Error on failure.

Usage

_wp_get_allowed_postdata( $post_data );
$post_data(array|WP_Error|null)
The array of post data to process, or an error object.
Default: $_POST superglobal

Changelog

Since 5.0.1 Introduced.

_wp_get_allowed_postdata() code WP 6.9

wp-admin/includes/post.php 
function _wp_get_allowed_postdata( $post_data = null ) {
	if ( empty( $post_data ) ) {
		$post_data = $_POST;
	}

	// Pass through errors.
	if ( is_wp_error( $post_data ) ) {
		return $post_data;
	}

	return array_diff_key( $post_data, array_flip( array( 'meta_input', 'file', 'guid' ) ) );
}