Unregisters a post type and removes the menu item

gistfile1.php

<?php

/*
 * Usage for a custom post type named 'movies':
 * unregister_post_type( 'movies' );
 *
 * Usage for the built in 'post' post type:
 * unregister_post_type( 'post', 'edit.php' );
*/
function unregister_post_type( $post_type, $slug = '' ){
	
	global $wp_post_types;
	
	if ( isset( $wp_post_types[ $post_type ] ) ) {
            unset( $wp_post_types[ $post_type ] );
        	
            $slug = ( !$slug ) ? 'edit.php?post_type=' . $post_type : $slug;
            remove_menu_page( $slug );
	}
}
?>

Was trying to get this to work, found virtually the same code following the answer here: http://wordpress.stackexchange.com/questions/3820/deregister-custom-post-types

I needed to use this in a Child Theme to unregister a Custom Post Type (not the slug) registered from a paid theme's plugin. I ended up removing the parameter from the function, setting $post_type inside the function equal to the name of the post type and then using the 'init' action. Couldn't get it to work without the action (could be b/c of the theme & the post type coming via plugin I suppose) so I have:

if ( ! function_exists( 'unregister_post_type' ) ) :
function unregister_post_type() {
    global $wp_post_types;
    if ( isset( $wp_post_types[ 'post_type_name' ] ) ) {
        unset( $wp_post_types[ 'post_type_name' ] );
        return true;
    }
    return false;
}
endif;

add_action('init', 'unregister_post_type');

Thanks for the provided code!

It did not work for me until gave it the priority '100':

add_action('init', 'unregister_post_type',100);

Priority of '11' worked for me (WordPress default is '10').

Where exactly do you place this code? in functions.php? and then when the custom post types are deregistered does it have to stay in there?

WordPress has this built in since 4.5: https://developer.wordpress.org/reference/functions/unregister_post_type/

@fgilio good find, just note that the function can't be used to remove default post types.

None of that worked for me; but probably because the CPT's were from the theme it self. "Flora"

What did work: [placed within child theme --> functions.php]

function delete_post_type(){
    unregister_post_type( 'wyde_portfolio' );
    unregister_post_type('wyde_team_member');
    unregister_post_type('wyde_testimonial');
}
add_action('init','delete_post_type');

Then used a plugin to rid DB of the post's data.
CPT Cleanup

None of this worked for me.. Why do we continue to use this horrible CMS? #clownworld

@fgilio it may be built in. - but doesn't work as this thread shows it is a clusterF8ck nightmare of a solution.

If you created the cpti in the admin panel - you have to delete it from the admin panel . functions.php doesn't seem to have any effect at all - shocking , I know. .. smh