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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 |
|---|---|
| 652 | |
| 653 | function max_attachment_size() { |
| 654 | // can be overridden with a filter - 0 means no limit |
| 655 | return apply_filters('import_attachment_size_limit', 0); |
| 656 | } |
| 657 | |
| 658 | function import_start() { |
| 659 | wp_defer_term_counting(true); |
| 660 | wp_defer_comment_counting(true); |
| 661 | do_action('import_start'); |
| 662 | } |
| 663 | |
| 664 | function import_end() { |
| 665 | do_action('import_end'); |
| 666 | |
| 667 | // clear the caches after backfilling |
| 668 | foreach ($this->post_ids_processed as $post_id) |
| 669 | clean_post_cache($post_id); |
| 670 | |