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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 | 
|---|---|
| 661 |                 * | 
| 662 |                 * The action concatenates the 'deactivate_' prefix with the plugin's basename | 
| 663 |                 * to create a dynamically-named action. | 
| 664 |                 * | 
| 665 |                 * @since 2.0.0 | 
| 666 |                 * | 
| 667 |                 * @param bool $network_deactivating Whether the plugin is deactivated for all sites in the network | 
| 668 |                 *                                   or just the current site. Multisite only. Default is false. | 
| 669 |                 */ | 
| 670 |                do_action( 'deactivate_' . $plugin, $network_deactivating ); | 
| 671 |  | 
| 672 |                /** | 
| 673 |                 * Fires for each plugin being deactivated in deactivate_plugins(), after deactivation | 
| 674 |                 * and when the $silent parameter is false. | 
| 675 |                 * | 
| 676 |                 * @since 2.9.0 | 
| 677 |                 * | 
| 678 |                 * @param string $plugin               Plugin path to main plugin file with plugin data. | 
| 679 |                 * @param bool   $network_deactivating Whether the plugin is deactivated for all sites in the network |