FFI::sizeof

(PHP 7 >= 7.4.0, PHP 8)

FFI::sizeof — Gets the size of C data or types

说明

public static FFI::sizeof(FFI\CData|FFI\CType &$ptr): int

Returns the size of the given FFI\CData or FFI\CType object.

参数

ptr: The handle of the C data or type.

返回值

The size of the memory area pointed at by ptr.

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wowabbs+php at gmail dot com ¶

4 years ago

<?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,
      ];
    }
?>