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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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30 | * The dynamic portion of the hook name, `$screen->id`, refers to the |
31 | * ID of a specific screen. For example, the screen ID for the Posts |
32 | * list table is edit-post, so the filter for that screen would be |
33 | * manage_edit-post_columns. |
34 | * |
35 | * @since 3.0.0 |
36 | * |
37 | * @param array $columns An array of column headers. Default empty. |
38 | */ |
39 | $column_headers[ $screen->id ] = apply_filters( "manage_{$screen->id}_columns", array() ); |
40 | } |
41 |
|
42 | return $column_headers[ $screen->id ]; |
43 | } |
44 |
|
45 | /** |
46 | * Get a list of hidden columns. |
47 | * |
48 | * @since 2.7.0 |