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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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702 | if ( 'page' === $post_type ) { |
703 |
|
704 | /** |
705 | * Filters the columns displayed in the Pages list table. |
706 | * |
707 | * @since 2.5.0 |
708 | * |
709 | * @param string[] $post_columns An associative array of column headings. |
710 | */ |
711 | $posts_columns = apply_filters( 'manage_pages_columns', $posts_columns ); |
712 | } else { |
713 |
|
714 | /** |
715 | * Filters the columns displayed in the Posts list table. |
716 | * |
717 | * @since 1.5.0 |
718 | * |
719 | * @param string[] $post_columns An associative array of column headings. |
720 | * @param string $post_type The post type slug. |