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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 |
|---|---|
| 3013 | * - `pre_post_content_filtered` |
| 3014 | * - `pre_post_parent` |
| 3015 | * - `pre_post_type` |
| 3016 | * - `pre_post_mime_type` |
| 3017 | * |
| 3018 | * @since 2.3.0 |
| 3019 | * |
| 3020 | * @param mixed $value Value of the post field. |
| 3021 | */ |
| 3022 | $value = apply_filters( "pre_{$field}", $value ); |
| 3023 | |
| 3024 | /** |
| 3025 | * Filters the value of a specific field before saving. |
| 3026 | * |
| 3027 | * Only applied to post fields with a name which is prefixed with `post_`. |
| 3028 | * |
| 3029 | * The dynamic portion of the hook name, `$field_no_prefix`, refers to the |
| 3030 | * post field name minus the `post_` prefix. Possible filter names include: |
| 3031 | * |