wp_get_update_php_url

WordPress Version: 5.1

/**
 * Gets the URL to learn more about updating the PHP version the site is running on.
 *
 * This URL can be overridden by specifying an environment variable `WP_UPDATE_PHP_URL` or by using the
 * {@see 'wp_update_php_url'} filter. Providing an empty string is not allowed and will result in the
 * default URL being used. Furthermore the page the URL links to should preferably be localized in the
 * site language.
 *
 * @since 5.1.0
 *
 * @return string URL to learn more about updating PHP.
 */
function wp_get_update_php_url()
{
    $default_url = wp_get_default_update_php_url();
    $update_url = $default_url;
    if (false !== getenv('WP_UPDATE_PHP_URL')) {
        $update_url = getenv('WP_UPDATE_PHP_URL');
    }
    /**
     * Filters the URL to learn more about updating the PHP version the site is running on.
     *
     * Providing an empty string is not allowed and will result in the default URL being used. Furthermore
     * the page the URL links to should preferably be localized in the site language.
     *
     * @since 5.1.0
     *
     * @param string $update_url URL to learn more about updating PHP.
     */
    $update_url = apply_filters('wp_update_php_url', $update_url);
    if (empty($update_url)) {
        $update_url = $default_url;
    }
    return $update_url;
}