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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 |
|---|---|
| 31 | * The dynamic portion of the hook name, `$screen->id`, refers to the |
| 32 | * ID of a specific screen. For example, the screen ID for the Posts |
| 33 | * list table is edit-post, so the filter for that screen would be |
| 34 | * manage_edit-post_columns. |
| 35 | * |
| 36 | * @since 3.0.0 |
| 37 | * |
| 38 | * @param array $columns An array of column headers. Default empty. |
| 39 | */ |
| 40 | $column_headers[ $screen->id ] = apply_filters( "manage_{$screen->id}_columns", array() ); |
| 41 | } |
| 42 | |
| 43 | return $column_headers[ $screen->id ]; |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * Get a list of hidden columns. |
| 48 | * |
| 49 | * @since 2.7.0 |