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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 |
---|---|
661 | if ( 'page' === $post_type ) { |
662 |
|
663 | /** |
664 | * Filters the columns displayed in the Pages list table. |
665 | * |
666 | * @since 2.5.0 |
667 | * |
668 | * @param string[] $post_columns An associative array of column headings. |
669 | */ |
670 | $posts_columns = apply_filters( 'manage_pages_columns', $posts_columns ); |
671 | } else { |
672 |
|
673 | /** |
674 | * Filters the columns displayed in the Posts list table. |
675 | * |
676 | * @since 1.5.0 |
677 | * |
678 | * @param string[] $post_columns An associative array of column headings. |
679 | * @param string $post_type The post type slug. |