Checks whether a FFI\CData is a null pointer

# FFI::isNull

(PHP 7 >= 7.4.0, PHP 8)

FFI::isNull — Checks whether a FFI\CData is a null pointer

### Description

public static FFI::isNull(FFI\CData `&$ptr`): bool

Checks whether a FFI\CData is a null pointer.

### Parameters

`ptr`
  The handle of the pointer to a C data structure.

### Return Values

Returns whether a FFI\CData is a null pointer.

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