register_post_meta( string $post_type, string $meta_key, array $args )

Registers a meta key for posts.

Parameters

$post_type: (string) (Required) Post type to register a meta key for. Pass an empty string to register the meta key across all existing post types.
$meta_key: (string) (Required) The meta key to register.
$args: (array) (Required) Data used to describe the meta key when registered. See register_meta() for a list of supported arguments.

Return

(bool) True if the meta key was successfully registered, false if not.

Source

File: wp-includes/post.php

function register_post_meta( $post_type, $meta_key, array $args ) {
	$args['object_subtype'] = $post_type;

	return register_meta( 'post', $meta_key, $args );
}

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Changelog

Changelog
Version	Description
WP-4.9.8	Introduced.