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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 |
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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 | * |