The What
Description
This construct (function) checks if the given post type has been registered with WordPress Core. It checks in the global variable $wp_post_types, which is an array of registered post types.
Parameters
post_type_key- The key or slug of the post type to be checked within the global variable
$wp_post_types.
Return Values
Returns true if the post type is registered. Else, false is returned.
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