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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 |
|---|---|
| 89 | |
| 90 | $cat_ID = (int) $cat_ID; |
| 91 | |
| 92 | // Are we updating or creating? |
| 93 | if (!empty ($cat_ID)) |
| 94 | $update = true; |
| 95 | else |
| 96 | $update = false; |
| 97 | |
| 98 | $cat_name = apply_filters('pre_category_name', $cat_name); |
| 99 | |
| 100 | if (empty ($category_nicename)) |
| 101 | $category_nicename = sanitize_title($cat_name); |
| 102 | else |
| 103 | $category_nicename = sanitize_title($category_nicename); |
| 104 | $category_nicename = apply_filters('pre_category_nicename', $category_nicename); |
| 105 | |
| 106 | if (empty ($category_description)) |
| 107 | $category_description = ''; |