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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 |
|---|---|
| 556 | |
| 557 | /** |
| 558 | * Filter the columns displayed in the Posts list table. |
| 559 | * |
| 560 | * @since 1.5.0 |
| 561 | * |
| 562 | * @param array $posts_columns An array of column names. |
| 563 | * @param string $post_type The post type slug. |
| 564 | */ |
| 565 | $posts_columns = apply_filters( 'manage_posts_columns', $posts_columns, $post_type ); |
| 566 | } |
| 567 | |
| 568 | /** |
| 569 | * Filter the columns displayed in the Posts list table for a specific post type. |
| 570 | * |
| 571 | * The dynamic portion of the hook name, `$post_type`, refers to the post type slug. |
| 572 | * |
| 573 | * @since 3.0.0 |
| 574 | * |