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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 |
---|---|
576 | if ( 'page' === $post_type ) { |
577 |
|
578 | /** |
579 | * Filters the columns displayed in the Pages list table. |
580 | * |
581 | * @since 2.5.0 |
582 | * |
583 | * @param array $post_columns An array of column names. |
584 | */ |
585 | $posts_columns = apply_filters( 'manage_pages_columns', $posts_columns ); |
586 | } else { |
587 |
|
588 | /** |
589 | * Filters the columns displayed in the Posts list table. |
590 | * |
591 | * @since 1.5.0 |
592 | * |
593 | * @param array $posts_columns An array of column names. |
594 | * @param string $post_type The post type slug. |