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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 |
|---|---|
| 4366 | * |
| 4367 | * @since 4.7.4 |
| 4368 | * |
| 4369 | * @link https://core.trac.wordpress.org/ticket/31071 |
| 4370 | * |
| 4371 | * @param array|null $months An array of objects with `month` and `year` |
| 4372 | * properties, or `null` (or any other non-array value) |
| 4373 | * for default behavior. |
| 4374 | */ |
| 4375 | $months = apply_filters( 'media_library_months_with_files', null ); |
| 4376 | if ( ! is_array( $months ) ) { |
| 4377 | $months = $wpdb->get_results( |
| 4378 | $wpdb->prepare( |
| 4379 | " |
| 4380 | SELECT DISTINCT YEAR( post_date ) AS year, MONTH( post_date ) AS month |
| 4381 | FROM $wpdb->posts |
| 4382 | WHERE post_type = %s |
| 4383 | ORDER BY post_date DESC |
| 4384 | ", |