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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 |
|---|---|
| 1272 | } |
| 1273 | |
| 1274 | /** |
| 1275 | * Filters the number of items to list per page when listing media items. |
| 1276 | * |
| 1277 | * @since 2.9.0 |
| 1278 | * |
| 1279 | * @param int $media_per_page Number of media to list. Default 20. |
| 1280 | */ |
| 1281 | $q['posts_per_page'] = apply_filters( 'upload_per_page', $media_per_page ); |
| 1282 | |
| 1283 | $post_mime_types = get_post_mime_types(); |
| 1284 | if ( isset( $q['post_mime_type'] ) && ! array_intersect( (array) $q['post_mime_type'], array_keys( $post_mime_types ) ) ) { |
| 1285 | unset( $q['post_mime_type'] ); |
| 1286 | } |
| 1287 | |
| 1288 | foreach ( array_keys( $post_mime_types ) as $type ) { |
| 1289 | if ( isset( $q['attachment-filter'] ) && "post_mime_type:$type" === $q['attachment-filter'] ) { |
| 1290 | $q['post_mime_type'] = $type; |