The is_subdomain_install() WordPress PHP function checks if a subdomain configuration is enabled in a WordPress multisite setup.
Usage
To use the function, simply call it and check the returned value:
$is_subdomain = is_subdomain_install();
Parameters
This function has no parameters.
More information
See WordPress Developer Resources: is_subdomain_install()
This function is available in WordPress since version 3.0.0.
Examples
Check if subdomain install and display message
Check if the site uses a subdomain configuration and display a message accordingly.
$is_subdomain = is_subdomain_install();
if ($is_subdomain) {
echo "This is a subdomain installation.";
} else {
echo "This is not a subdomain installation.";
}
Change the behavior based on subdomain install
Perform different actions based on whether the site is using a subdomain configuration.
$is_subdomain = is_subdomain_install();
if ($is_subdomain) {
// Perform subdomain specific action
} else {
// Perform non-subdomain specific action
}
Show different content for subdomain and non-subdomain installs
Display different content on the site based on the type of installation.
$is_subdomain = is_subdomain_install();
if ($is_subdomain) {
echo "Content for subdomain installations";
} else {
echo "Content for non-subdomain installations";
}
Redirect user based on subdomain installation
Redirect users to different pages depending on whether the site is using a subdomain configuration.
$is_subdomain = is_subdomain_install();
if ($is_subdomain) {
wp_redirect("https://subdomain.example.com");
exit;
} else {
wp_redirect("https://example.com");
exit;
}
Enqueue different styles or scripts for subdomain installations
Load different styles or scripts based on the type of installation.
$is_subdomain = is_subdomain_install();
if ($is_subdomain) {
wp_enqueue_style("subdomain-style", "path/to/subdomain-style.css");
} else {
wp_enqueue_style("non-subdomain-style", "path/to/non-subdomain-style.css");
}