I\'m trying to create archive pages for my custom post type. I create custom post types from within custom classes:

functions.php

include_once(get_template_directory() . \'/admin/admin_init.php\');

admin_init.php

include_once(ADMIN_CPT_DIR . \'/CPT.php\');

CPT.php

class CPT
{
    protected $cpt_name;

    public function __construct($cpt_name)
    {
        $this->cpt_name = $cpt_name;
        add_action(\'init\', array( $this, \'cpt_init\' ) );
    }

    public function cpt_init()
   {
        $labels = array(
        \'name\' => __(\'custom_name\', \'textDomain\'),
        \'singular_name\' => __(\'custom_name\', \'textDomain\')
         );

        $args = array(
        \'labels\' => $labels,
        \'public\' => true,
        \'has_archive\' => true,
        \'publicly_queryable\' => true,
        \'exclude_from_search\' => false,
        \'show_ui\' => true,
        \'show_in_menu\' => true,
        \'has_archive\' => true,
        \'query_var\' => true,
        \'rewrite\' => array(\'slug\' => \'custom_name\'),
        \'supports\' =>array(\'title\',\'editor\', \'custom-fields\',\'thumbnail\')
    );

    register_post_type( $this->cpt_name, $args );
   }
}

if( is_admin() )
    $cpt = new CPT(\'cpt_child\');

The custom post type is registered and all works fine, but I always get a 404 when trying to access the archive page (archive-custom_name.php).

If I take the inner part of the cpt_init - method and put it into the functions.php like so:

add_action( \'init\', \'create_post_type\' );

    function create_post_type()
    {
        $labels = array(
        \'name\' => __(\'mycpt\', \'synTh_textDomain\'),
        \'singular_name\' => __(\'mycpt\', \'synTh_textDomain\')
        );

        $args = array(
        \'labels\' => $labels,
        \'public\' => true,
        \'has_archive\' => true,
        \'publicly_queryable\' => true,
        \'exclude_from_search\' => false,
        \'show_ui\' => true,
        \'show_in_menu\' => true,
        \'has_archive\' => true,
        \'query_var\' => true,
        \'rewrite\' => array(\'slug\' => \'boom\'),
        \'supports\' =>array(\'title\',\'editor\', \'custom-fields\',\'thumbnail\')
        );  

        register_post_type( \'mycpt\', $args );
    }

everything works as expected. There is an archive-boom.php, which I can access via: www.domain.com/boom/

I flushed the permalinks settings and I have them set to postname.

Is there a difference, when attaching to a hook from inside a class??

I\'m trying to create archive pages for my custom post type. I create custom post types from within custom classes:

functions.php

include_once(get_template_directory() . \'/admin/admin_init.php\');

admin_init.php

include_once(ADMIN_CPT_DIR . \'/CPT.php\');

CPT.php

class CPT
{
    protected $cpt_name;

    public function __construct($cpt_name)
    {
        $this->cpt_name = $cpt_name;
        add_action(\'init\', array( $this, \'cpt_init\' ) );
    }

    public function cpt_init()
   {
        $labels = array(
        \'name\' => __(\'custom_name\', \'textDomain\'),
        \'singular_name\' => __(\'custom_name\', \'textDomain\')
         );

        $args = array(
        \'labels\' => $labels,
        \'public\' => true,
        \'has_archive\' => true,
        \'publicly_queryable\' => true,
        \'exclude_from_search\' => false,
        \'show_ui\' => true,
        \'show_in_menu\' => true,
        \'has_archive\' => true,
        \'query_var\' => true,
        \'rewrite\' => array(\'slug\' => \'custom_name\'),
        \'supports\' =>array(\'title\',\'editor\', \'custom-fields\',\'thumbnail\')
    );

    register_post_type( $this->cpt_name, $args );
   }
}

if( is_admin() )
    $cpt = new CPT(\'cpt_child\');

The custom post type is registered and all works fine, but I always get a 404 when trying to access the archive page (archive-custom_name.php).

If I take the inner part of the cpt_init - method and put it into the functions.php like so:

add_action( \'init\', \'create_post_type\' );

    function create_post_type()
    {
        $labels = array(
        \'name\' => __(\'mycpt\', \'synTh_textDomain\'),
        \'singular_name\' => __(\'mycpt\', \'synTh_textDomain\')
        );

        $args = array(
        \'labels\' => $labels,
        \'public\' => true,
        \'has_archive\' => true,
        \'publicly_queryable\' => true,
        \'exclude_from_search\' => false,
        \'show_ui\' => true,
        \'show_in_menu\' => true,
        \'has_archive\' => true,
        \'query_var\' => true,
        \'rewrite\' => array(\'slug\' => \'boom\'),
        \'supports\' =>array(\'title\',\'editor\', \'custom-fields\',\'thumbnail\')
        );  

        register_post_type( \'mycpt\', $args );
    }

everything works as expected. There is an archive-boom.php, which I can access via: www.domain.com/boom/

I flushed the permalinks settings and I have them set to postname.

Is there a difference, when attaching to a hook from inside a class??