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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 |
---|---|
311 | if ( 'page' == $post_type ) { |
312 |
|
313 | /** |
314 | * Filter the columns displayed in the Pages list table. |
315 | * |
316 | * @since 2.5.0 |
317 | * |
318 | * @param array $post_columns An array of column names. |
319 | */ |
320 | $posts_columns = apply_filters( 'manage_pages_columns', $posts_columns ); |
321 | } else { |
322 |
|
323 | /** |
324 | * Filter the columns displayed in the Posts list table. |
325 | * |
326 | * @since 1.5.0 |
327 | * |
328 | * @param array $posts_columns An array of column names. |
329 | * @param string $post_type The post type slug. |