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    FFI::sizeof

    (PHP 7 >= 7.4.0, PHP 8)

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

    説明

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

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

    パラメータ

    ptr

    The handle of the C data or type.

    戻り値

    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
    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,
    ];
    }
    ?>
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