array $new_site_email, WP_Site $site, WP_User $user )
Filters the content of the email sent to the Multisite network administrator when a new site is created.
Content should be formatted for transmission via wp_mail() .
Used to build wp_mail() .
tostringThe email address of the recipient.
subjectstringThe subject of the email.
messagestringThe content of the email.
Site object of the new site.
User object of the administrator of the new site.
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$new_site_email = apply_filters( 'new_site_email', $new_site_email, $site, $user );