FFI::sizeof

(PHP 7 >= 7.4.0, PHP 8)

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

Descrizione

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

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

Elenco dei parametri

ptr: The handle of the C data or type.

Valori restituiti

The size of the memory area pointed at by ptr.

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User Contributed Notes 1 note

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wowabbs+php at gmail dot com ¶

3 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,
      ];
    }
?>

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