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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 |
---|---|
653 | if ( 'page' === $post_type ) { |
654 |
|
655 | /** |
656 | * Filters the columns displayed in the Pages list table. |
657 | * |
658 | * @since 2.5.0 |
659 | * |
660 | * @param string[] $post_columns An associative array of column headings. |
661 | */ |
662 | $posts_columns = apply_filters( 'manage_pages_columns', $posts_columns ); |
663 | } else { |
664 |
|
665 | /** |
666 | * Filters the columns displayed in the Posts list table. |
667 | * |
668 | * @since 1.5.0 |
669 | * |
670 | * @param string[] $post_columns An associative array of column headings. |
671 | * @param string $post_type The post type slug. |