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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 |
|---|---|
| 514 | |
| 515 | if ( !in_array($plugin, $current) ) { |
| 516 | if ( !empty($redirect) ) |
| 517 | wp_redirect(add_query_arg('_error_nonce', wp_create_nonce('plugin-activation-error_' . $plugin), $redirect)); // we'll override this later if the plugin can be included without fatal error |
| 518 | ob_start(); |
| 519 | include_once(WP_PLUGIN_DIR . '/' . $plugin); |
| 520 | |
| 521 | if ( ! $silent ) { |
| 522 | do_action( 'activate_plugin', $plugin, $network_wide ); |
| 523 | do_action( 'activate_' . $plugin, $network_wide ); |
| 524 | } |
| 525 | |
| 526 | if ( $network_wide ) { |
| 527 | $current[$plugin] = time(); |
| 528 | update_site_option( 'active_sitewide_plugins', $current ); |
| 529 | } else { |
| 530 | $current[] = $plugin; |
| 531 | sort($current); |
| 532 | update_option('active_plugins', $current); |