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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 |
|---|---|
| 351 | |
| 352 | /** |
| 353 | * Filter the columns displayed in the Posts list table. |
| 354 | * |
| 355 | * @since 1.5.0 |
| 356 | * |
| 357 | * @param array $posts_columns An array of column names. |
| 358 | * @param string $post_type The post type slug. |
| 359 | */ |
| 360 | $posts_columns = apply_filters( 'manage_posts_columns', $posts_columns, $post_type ); |
| 361 | } |
| 362 | |
| 363 | /** |
| 364 | * Filter the columns displayed in the Posts list table for a specific post type. |
| 365 | * |
| 366 | * The dynamic portion of the hook name, `$post_type`, refers to the post type slug. |
| 367 | * |
| 368 | * @since 3.0.0 |
| 369 | * |