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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 |
|---|---|
| 3141 | * - `content_filtered_save_pre` |
| 3142 | * - `parent_save_pre` |
| 3143 | * - `type_save_pre` |
| 3144 | * - `mime_type_save_pre` |
| 3145 | * |
| 3146 | * @since 2.3.0 |
| 3147 | * |
| 3148 | * @param mixed $value Value of the post field. |
| 3149 | */ |
| 3150 | $value = apply_filters( "{$field_no_prefix}_save_pre", $value ); |
| 3151 | } else { |
| 3152 | /** |
| 3153 | * Filters the value of a specific field before saving. |
| 3154 | * |
| 3155 | * Only applied to post fields with a name which is prefixed with `post_`. |
| 3156 | * |
| 3157 | * The dynamic portion of the hook name, `$field_no_prefix`, refers to the |
| 3158 | * post field name minus the `post_` prefix. Possible filter names include: |
| 3159 | * |