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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 |
---|---|
382 | if ( 'page' == $post_type ) { |
383 |
|
384 | /** |
385 | * Filter the columns displayed in the Pages list table. |
386 | * |
387 | * @since 2.5.0 |
388 | * |
389 | * @param array $post_columns An array of column names. |
390 | */ |
391 | $posts_columns = apply_filters( 'manage_pages_columns', $posts_columns ); |
392 | } else { |
393 |
|
394 | /** |
395 | * Filter the columns displayed in the Posts list table. |
396 | * |
397 | * @since 1.5.0 |
398 | * |
399 | * @param array $posts_columns An array of column names. |
400 | * @param string $post_type The post type slug. |