Wordpress Role Custom Capability is set true but returns false

Today I solved it.

It is neccessary to assign an object id for the second parameter to the current_user_can() function to get the correct return of single pointed capabilities (eg. 'edit_post'). Otherwise the function will return false, if this parameter is not set.

As inside the WordPress Documentation:

If omitted you may receive an 'Undefined offset: 0' warning (this is because the current_user_can function eventually calls map_meta_cap which when checking against meta capabilities expects an array but is only supplied a single value)

Try to register these capabilities to the custom post type event first , and then assign those capabilities to organiser

Like this :

function create_my_post_types() {    register_post_type(        'movie',        array(            'public' => true,            'capability_type' => 'movie',            'capabilities' => array(                'publish_posts' => 'publish_movies',                'edit_posts' => 'edit_movies',                'edit_others_posts' => 'edit_others_movies',                'delete_posts' => 'delete_movies',                'delete_others_posts' => 'delete_others_movies',                'read_private_posts' => 'read_private_movies',                'edit_post' => 'edit_movie',                'delete_post' => 'delete_movie',                'read_post' => 'read_movie',            ),        )    );}

Change the code to event post type.

And check the user capababilities by below code instead :

add_filter( 'map_meta_cap', 'my_map_meta_cap', 10, 4 );function my_map_meta_cap( $caps, $cap, $user_id, $args ) {    /* If editing, deleting, or reading a movie, get the post and post type object. */    if ( 'edit_movie' == $cap || 'delete_movie' == $cap || 'read_movie' == $cap ) {        $post = get_post( $args[0] );        $post_type = get_post_type_object( $post->post_type );        /* Set an empty array for the caps. */        $caps = array();    }    /* If editing a movie, assign the required capability. */    if ( 'edit_movie' == $cap ) {        if ( $user_id == $post->post_author )            $caps[] = $post_type->cap->edit_posts;        else            $caps[] = $post_type->cap->edit_others_posts;    }    /* If deleting a movie, assign the required capability. */    elseif ( 'delete_movie' == $cap ) {        if ( $user_id == $post->post_author )            $caps[] = $post_type->cap->delete_posts;        else            $caps[] = $post_type->cap->delete_others_posts;    }    /* If reading a private movie, assign the required capability. */    elseif ( 'read_movie' == $cap ) {        if ( 'private' != $post->post_status )            $caps[] = 'read';        elseif ( $user_id == $post->post_author )            $caps[] = 'read';        else            $caps[] = $post_type->cap->read_private_posts;    }    /* Return the capabilities required by the user. */    return $caps;}

Try user_can(). You will need to pass the user ID as first parameter. You can get it through get_current_user_id().