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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 |
---|---|
579 | if ( 'page' === $post_type ) { |
580 |
|
581 | /** |
582 | * Filters the columns displayed in the Pages list table. |
583 | * |
584 | * @since 2.5.0 |
585 | * |
586 | * @param array $post_columns An array of column names. |
587 | */ |
588 | $posts_columns = apply_filters( 'manage_pages_columns', $posts_columns ); |
589 | } else { |
590 |
|
591 | /** |
592 | * Filters the columns displayed in the Posts list table. |
593 | * |
594 | * @since 1.5.0 |
595 | * |
596 | * @param array $posts_columns An array of column names. |
597 | * @param string $post_type The post type slug. |