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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 |
|---|---|
| 322 | |
| 323 | /** |
| 324 | * Filter the columns displayed in the Posts list table. |
| 325 | * |
| 326 | * @since 1.5.0 |
| 327 | * |
| 328 | * @param array $posts_columns An array of column names. |
| 329 | * @param string $post_type The post type slug. |
| 330 | */ |
| 331 | $posts_columns = apply_filters( 'manage_posts_columns', $posts_columns, $post_type ); |
| 332 | } |
| 333 | |
| 334 | /** |
| 335 | * Filter the columns displayed in the Posts list table for a specific post type. |
| 336 | * |
| 337 | * The dynamic portion of the hook name, $post_type, refers to the post type slug. |
| 338 | * |
| 339 | * @since 3.0.0 |
| 340 | * |