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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 |
|---|---|
| 3043 | * - `content_filtered_save_pre` |
| 3044 | * - `parent_save_pre` |
| 3045 | * - `type_save_pre` |
| 3046 | * - `mime_type_save_pre` |
| 3047 | * |
| 3048 | * @since 2.3.0 |
| 3049 | * |
| 3050 | * @param mixed $value Value of the post field. |
| 3051 | */ |
| 3052 | $value = apply_filters( "{$field_no_prefix}_save_pre", $value ); |
| 3053 | } else { |
| 3054 | /** |
| 3055 | * Filters the value of a specific field before saving. |
| 3056 | * |
| 3057 | * Only applied to post fields with a name which is prefixed with `post_`. |
| 3058 | * |
| 3059 | * The dynamic portion of the hook name, `$field_no_prefix`, refers to the |
| 3060 | * post field name minus the `post_` prefix. Possible filter names include: |
| 3061 | * |