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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 | 
|---|---|
| 2901 |       * Filters whether to send the network admin email change notification email. | 
| 2902 |       * | 
| 2903 |       * @since 4.9.0 | 
| 2904 |       * | 
| 2905 |       * @param bool   $send       Whether to send the email notification. | 
| 2906 |       * @param string $old_email  The old network admin email address. | 
| 2907 |       * @param string $new_email  The new network admin email address. | 
| 2908 |       * @param int    $network_id ID of the network. | 
| 2909 |       */ | 
| 2910 |      $send = apply_filters( 'send_network_admin_email_change_email', $send, $old_email, $new_email, $network_id ); | 
| 2911 |  | 
| 2912 |      if ( ! $send ) { | 
| 2913 |           return; | 
| 2914 |      } | 
| 2915 |  | 
| 2916 |      /* translators: Do not translate OLD_EMAIL, NEW_EMAIL, SITENAME, SITEURL: those are placeholders. */ | 
| 2917 |      $email_change_text = __( | 
| 2918 |           'Hi, | 
| 2919 |  |