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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 |
|---|---|
| 1292 | } |
| 1293 | |
| 1294 | /** |
| 1295 | * Filters the number of items to list per page when listing media items. |
| 1296 | * |
| 1297 | * @since 2.9.0 |
| 1298 | * |
| 1299 | * @param int $media_per_page Number of media to list. Default 20. |
| 1300 | */ |
| 1301 | $q['posts_per_page'] = apply_filters( 'upload_per_page', $media_per_page ); |
| 1302 | |
| 1303 | $post_mime_types = get_post_mime_types(); |
| 1304 | if ( isset( $q['post_mime_type'] ) && ! array_intersect( (array) $q['post_mime_type'], array_keys( $post_mime_types ) ) ) { |
| 1305 | unset( $q['post_mime_type'] ); |
| 1306 | } |
| 1307 | |
| 1308 | foreach ( array_keys( $post_mime_types ) as $type ) { |
| 1309 | if ( isset( $q['attachment-filter'] ) && "post_mime_type:$type" === $q['attachment-filter'] ) { |
| 1310 | $q['post_mime_type'] = $type; |