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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 |
|---|---|
| 4266 | * |
| 4267 | * @since 4.7.4 |
| 4268 | * |
| 4269 | * @link https://core.trac.wordpress.org/ticket/31071 |
| 4270 | * |
| 4271 | * @param array|null $months An array of objects with `month` and `year` |
| 4272 | * properties, or `null` (or any other non-array value) |
| 4273 | * for default behavior. |
| 4274 | */ |
| 4275 | $months = apply_filters( 'media_library_months_with_files', null ); |
| 4276 | if ( ! is_array( $months ) ) { |
| 4277 | $months = $wpdb->get_results( |
| 4278 | $wpdb->prepare( |
| 4279 | " |
| 4280 | SELECT DISTINCT YEAR( post_date ) AS year, MONTH( post_date ) AS month |
| 4281 | FROM $wpdb->posts |
| 4282 | WHERE post_type = %s |
| 4283 | ORDER BY post_date DESC |
| 4284 | ", |