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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 |
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336 |
|
337 | /** |
338 | * Filter the columns displayed in the Posts list table. |
339 | * |
340 | * @since 1.5.0 |
341 | * |
342 | * @param array $posts_columns An array of column names. |
343 | * @param string $post_type The post type slug. |
344 | */ |
345 | $posts_columns = apply_filters( 'manage_posts_columns', $posts_columns, $post_type ); |
346 | } |
347 |
|
348 | /** |
349 | * Filter the columns displayed in the Posts list table for a specific post type. |
350 | * |
351 | * The dynamic portion of the hook name, $post_type, refers to the post type slug. |
352 | * |
353 | * @since 3.0.0 |
354 | * |