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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 |
---|---|
325 | if ( 'page' == $post_type ) { |
326 |
|
327 | /** |
328 | * Filter the columns displayed in the Pages list table. |
329 | * |
330 | * @since 2.5.0 |
331 | * |
332 | * @param array $post_columns An array of column names. |
333 | */ |
334 | $posts_columns = apply_filters( 'manage_pages_columns', $posts_columns ); |
335 | } else { |
336 |
|
337 | /** |
338 | * Filter the columns displayed in the Posts list table. |
339 | * |
340 | * @since 1.5.0 |
341 | * |
342 | * @param array $posts_columns An array of column names. |
343 | * @param string $post_type The post type slug. |