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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 |
|---|---|
| 403 | * Fires when the WP_Customize_Setting::preview() method is called for settings |
| 404 | * not handled as theme_mods or options. |
| 405 | * |
| 406 | * The dynamic portion of the hook name, `$this->type`, refers to the setting type. |
| 407 | * |
| 408 | * @since 4.1.0 |
| 409 | * |
| 410 | * @param WP_Customize_Setting $setting WP_Customize_Setting instance. |
| 411 | */ |
| 412 | do_action( "customize_preview_{$this->type}", $this ); |
| 413 | } |
| 414 | |
| 415 | $this->is_previewed = true; |
| 416 | |
| 417 | return true; |
| 418 | } |
| 419 | |
| 420 | /** |
| 421 | * Clear out the previewed-applied flag for a multidimensional-aggregated value whenever its post value is updated. |