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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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591 |
|
592 | /** |
593 | * Filters the columns displayed in the Posts list table. |
594 | * |
595 | * @since 1.5.0 |
596 | * |
597 | * @param array $posts_columns An array of column names. |
598 | * @param string $post_type The post type slug. |
599 | */ |
600 | $posts_columns = apply_filters( 'manage_posts_columns', $posts_columns, $post_type ); |
601 | } |
602 |
|
603 | /** |
604 | * Filters the columns displayed in the Posts list table for a specific post type. |
605 | * |
606 | * The dynamic portion of the hook name, `$post_type`, refers to the post type slug. |
607 | * |
608 | * @since 3.0.0 |
609 | * |