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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 |
|---|---|
| 747 | function is_valid_meta_key($key) { |
| 748 | // skip attachment metadata since we'll regenerate it from scratch |
| 749 | if ( $key == '_wp_attached_file' || $key == '_wp_attachment_metadata' ) |
| 750 | return false; |
| 751 | return $key; |
| 752 | } |
| 753 | |
| 754 | // give the user the option of creating new users to represent authors in the import file? |
| 755 | function allow_create_users() { |
| 756 | return apply_filters('import_allow_create_users', true); |
| 757 | } |
| 758 | |
| 759 | // give the user the option of downloading and importing attached files |
| 760 | function allow_fetch_attachments() { |
| 761 | return apply_filters('import_allow_fetch_attachments', true); |
| 762 | } |
| 763 | |
| 764 | function max_attachment_size() { |
| 765 | // can be overridden with a filter - 0 means no limit |