How to get server-side information in PHP, php gets server-side_PHP tutorial

/**
* Get system information
*
* @return array
​*/
function getSystemInfo()
{
$systemInfo = array();

// System
$systemInfo['os'] = PHP_OS;

// PHP version
$systemInfo['phpversion'] = PHP_VERSION;

// Apache version
$systemInfo['apacheversion'] = apache_get_version();

// ZEND version
$systemInfo['zendversion'] = zend_version();

// GD related
if (function_exists('gd_info'))
{
$gdInfo = gd_info();
$systemInfo['gdsupport'] = true;
$systemInfo['gdversion'] = $gdInfo['GD Version'];
}
else
{
$systemInfo['gdsupport'] = false;
$systemInfo['gdversion'] = '';
}

// Safe Mode
$systemInfo['safemode'] = ini_get('safe_mode');

// Register global variables
$systemInfo['registerglobals'] = ini_get('register_globals');

// Enable magic reference
$systemInfo['magicquotes'] = (function_exists("get_magic_quotes_gpc") && get_magic_quotes_gpc());

//Maximum upload file size
$systemInfo['maxuploadfile'] = ini_get('upload_max_filesize');
// Maximum memory occupied by script running
$systemInfo['memorylimit'] = get_cfg_var("memory_limit") ? get_cfg_var("memory_limit") : '-';

return $systemInfo;
}