Проверка наличия curl на веб сервере

<?php
// Script to test if the CURL extension is installed on this server
// Define function to test
function _is_curl_installed() {
 if (in_array ('curl', get_loaded_extensions())) {
 return true;
 }
 else {
 return false;
 }
}
// Ouput text to user based on test
if (_is_curl_installed()) {
 echo "cURL is <span style=\"color:#4fa361;\">installed</span> on this server";
} else {
 echo "cURL is <span style=\"color:#dc4f49\">not installed</span> on this server";
}
?>