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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 |
---|---|
434 | if ( 'page' == $post_type ) { |
435 |
|
436 | /** |
437 | * Filter the columns displayed in the Pages list table. |
438 | * |
439 | * @since 2.5.0 |
440 | * |
441 | * @param array $post_columns An array of column names. |
442 | */ |
443 | $posts_columns = apply_filters( 'manage_pages_columns', $posts_columns ); |
444 | } else { |
445 |
|
446 | /** |
447 | * Filter the columns displayed in the Posts list table. |
448 | * |
449 | * @since 1.5.0 |
450 | * |
451 | * @param array $posts_columns An array of column names. |
452 | * @param string $post_type The post type slug. |