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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
Line | Code |
---|---|
603 | /** |
604 | * Filters the columns displayed in the Posts list table for a specific post type. |
605 | * |
606 | * The dynamic portion of the hook name, `$post_type`, refers to the post type slug. |
607 | * |
608 | * @since 3.0.0 |
609 | * |
610 | * @param array $post_columns An array of column names. |
611 | */ |
612 | return apply_filters( "manage_{$post_type}_posts_columns", $posts_columns ); |
613 | } |
614 |
|
615 | /** |
616 | * |
617 | * @return array |
618 | */ |
619 | protected function get_sortable_columns() { |
620 | return array( |
621 | 'title' => 'title', |