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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 |
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803 |
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804 | /** |
805 | * Filters the relative path to an uploaded file. |
806 | * |
807 | * @since 2.9.0 |
808 | * |
809 | * @param string $new_path Relative path to the file. |
810 | * @param string $path Full path to the file. |
811 | */ |
812 | return apply_filters( '_wp_relative_upload_path', $new_path, $path ); |
813 | } |
814 |
|
815 | /** |
816 | * Retrieves all children of the post parent ID. |
817 | * |
818 | * Normally, without any enhancements, the children would apply to pages. In the |
819 | * context of the inner workings of WordPress, pages, posts, and attachments |
820 | * share the same table, so therefore the functionality could apply to any one |
821 | * of them. It is then noted that while this function does not work on posts, it |