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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 |
---|---|
573 | if ( 'page' === $post_type ) { |
574 |
|
575 | /** |
576 | * Filters the columns displayed in the Pages list table. |
577 | * |
578 | * @since 2.5.0 |
579 | * |
580 | * @param array $post_columns An array of column names. |
581 | */ |
582 | $posts_columns = apply_filters( 'manage_pages_columns', $posts_columns ); |
583 | } else { |
584 |
|
585 | /** |
586 | * Filters the columns displayed in the Posts list table. |
587 | * |
588 | * @since 1.5.0 |
589 | * |
590 | * @param array $posts_columns An array of column names. |
591 | * @param string $post_type The post type slug. |