$startMemory = memory_get_peak_usage();
//code
$endMemory = memory_get_peak_usage();
$memoryUsage = $endMemory - $startMemory;
$xxx['startMemory'] = $startMemory;
$xxx['endMemory'] = $endMemory;
$xxx['memoryUsage'] = $memoryUsage/1024/1024;
halt($xxx);