FFI::sizeof

<?php // Sample using sizeof    Function _Win_Ffi_GlobalMemoryStatus()    {      static $Kernel32, $a, $r;      $Kernel32??=FFI::cdef(<<<'IDL'        typedef struct _MemoryStatus {          uint32_t Length        ;          uint32_t MemoryLoad    ;          uint64_t TotalPhys     ;          uint64_t AvailPhys     ;          uint64_t TotalPageFile ;          uint64_t AvailPageFile ;          uint64_t TotalVirtual  ;          uint64_t AvailVirtual  ;        } MemoryStatus;        void GlobalMemoryStatus(MemoryStatus* buf);       IDL, 'Kernel32.dll');      $a??=$Kernel32->new('MemoryStatus');      $a->Length =$Kernel32::sizeof($Kernel32->type('MemoryStatus'));      $r??=FFI::addr($a);      $Kernel32->GlobalMemoryStatus($r);      return [        'Total' =>$a->TotalPhys,        'Free'  =>$a->TotalPhys-$a->AvailPhys,        'Load'  =>$a->MemoryLoad*0.01,      ];    }?>