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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 |
|---|---|
| 190 | * Fires when the {@see WP_Customize_Setting::preview()} method is called for settings |
| 191 | * not handled as theme_mods or options. |
| 192 | * |
| 193 | * The dynamic portion of the hook name, `$this->type`, refers to the setting type. |
| 194 | * |
| 195 | * @since 4.1.0 |
| 196 | * |
| 197 | * @param WP_Customize_Setting $this {@see WP_Customize_Setting} instance. |
| 198 | */ |
| 199 | do_action( "customize_preview_{$this->type}", $this ); |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * Callback function to filter the theme mods and options. |
| 205 | * |
| 206 | * If switch_to_blog() was called after the preview() method, and the current |
| 207 | * blog is now not the same blog, then this method does a no-op and returns |
| 208 | * the original value. |