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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 |
|---|---|
| 181 | |
| 182 | /** |
| 183 | * Filter response of WP_Customize_Panel::active(). |
| 184 | * |
| 185 | * @since 4.1.0 |
| 186 | * |
| 187 | * @param bool $active Whether the Customizer panel is active. |
| 188 | * @param WP_Customize_Panel $panel {@see WP_Customize_Panel} instance. |
| 189 | */ |
| 190 | $active = apply_filters( 'customize_panel_active', $active, $panel ); |
| 191 | |
| 192 | return $active; |
| 193 | } |
| 194 | |
| 195 | /** |
| 196 | * Default callback used when invoking {@see WP_Customize_Panel::active()}. |
| 197 | * |
| 198 | * Subclasses can override this with their specific logic, or they may |
| 199 | * provide an 'active_callback' argument to the constructor. |