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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 |
|---|---|
| 2914 | * Filters whether to send the network admin email change notification email. |
| 2915 | * |
| 2916 | * @since 4.9.0 |
| 2917 | * |
| 2918 | * @param bool $send Whether to send the email notification. |
| 2919 | * @param string $old_email The old network admin email address. |
| 2920 | * @param string $new_email The new network admin email address. |
| 2921 | * @param int $network_id ID of the network. |
| 2922 | */ |
| 2923 | $send = apply_filters( 'send_network_admin_email_change_email', $send, $old_email, $new_email, $network_id ); |
| 2924 | |
| 2925 | if ( ! $send ) { |
| 2926 | return; |
| 2927 | } |
| 2928 | |
| 2929 | /* translators: Do not translate OLD_EMAIL, NEW_EMAIL, SITENAME, SITEURL: those are placeholders. */ |
| 2930 | $email_change_text = __( |
| 2931 | 'Hi, |
| 2932 | |