apply_filters( ‘postmeta_form_keys’, array|null $keys, WP_Post $post )

Filters values for the meta key dropdown in the Custom Fields meta box.

Description

Returning a non-null value will effectively short-circuit and avoid a potentially expensive query against postmeta.

$keysarray|null: Pre-defined meta keys to be used in place of a postmeta query. Default null.
$postWP_Post: The current post object.

$keys = apply_filters( 'postmeta_form_keys', null, $post );

Used by	Description
meta_form()`wp-admin/includes/template.php`	Prints the form in the Custom Fields meta box.

Version	Description
4.4.0	Introduced.

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