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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 |
---|---|
348 | /** |
349 | * Filter the columns displayed in the Posts list table for a specific post type. |
350 | * |
351 | * The dynamic portion of the hook name, $post_type, refers to the post type slug. |
352 | * |
353 | * @since 3.0.0 |
354 | * |
355 | * @param array $post_columns An array of column names. |
356 | */ |
357 | $posts_columns = apply_filters( "manage_{$post_type}_posts_columns", $posts_columns ); |
358 |
|
359 | return $posts_columns; |
360 | } |
361 |
|
362 | protected function get_sortable_columns() { |
363 | return array( |
364 | 'title' => 'title', |
365 | 'parent' => 'parent', |
366 | 'comments' => 'comment_count', |