apache_get_modules() is only available when the PHP is installed as a module and not as a CGI == It doesn't work with php-fpm.(PHP 4 >= 4.3.2, PHP 5, PHP 7, PHP 8)
apache_get_modules — Retourne la liste des modules Apache chargés
Cette fonction ne contient aucun paramètre.
Un tableau contenant les modules Apache chargés.
Exemple #1 Exemple avec apache_get_modules()
<?php
print_r(apache_get_modules());
?>Résultat de l'exemple ci-dessus est similaire à :
Array
(
    [0] => core
    [1] => http_core
    [2] => mod_so
    [3] => sapi_apache2
    [4] => mod_mime
    [5] => mod_rewrite
)
apache_get_modules() is only available when the PHP is installed as a module and not as a CGI == It doesn't work with php-fpm.<?php
function apache_module_exists($module)
{
    return in_array($module, apache_get_modules());
}
?>this function can be used on older php versions using something like "/etc/httpd/httpd.conf" as $fname
<?php
function get_modules ($fname){
   if (is_readable($fname)){
      $fcont = file($fname);
      if (is_array($fcont)){
          foreach ($fcont as $line){
              if (preg_match ("/^LoadModule\s*(\S*)\s*(\S*)/i",$line,$match)){
                  $return[$match[2]] = $match[1];
              }
          }
      }
   }
   return $return;
}
?>/** 
 * Check if a Apache module is loaded (even if php run as fcgi or cgi )
 * 
 * @param string $module 
 * @return bool 
 */
public static function apache_check_module(string $module): bool
{
    $module  = ($module ? strval(value: $module) : '');
    if (function_exists('apache_get_modules')  && !empty($module)) {
        if (in_array(needle: $module, haystack: apache_get_modules())) {
            return TRUE;
        }
    } else if (!empty(shell_exec(command: 'apache2ctl -M | grep \'' . $module . '\''))) {
        return TRUE;
    } else {
        return FALSE;
    }
}