Why i cannot use word, byte on struct in PHP FFI? But char, int, short works?

Question

My code:

public function loadFFI()
{
    FFI::load("C:\phptest\dummy.h");
}

dummy.h:

struct ffitest
{
    char test1[16];
    byte test2;
};

Error:

PHP Fatal error: Uncaught FFI\ParserException: Undefined C type "byte" at line 4

Why can I not use word or byte in this struct in PHP FFI? char, int, and short work as expected.

I think neither byte nor char are valied PHP types, see https://www.php.net/manual/en/language.types.intro.php — KargWare, Feb 23 '21 at 18:30

miken32 · Accepted Answer · 2021-02-23T19:45:19.067

2

There is no such thing as a byte data type in standard C. Since char is already defined as a single byte, you should use that instead. If you want values 0-255 instead of -127 to 127, don't forget to make it an unsigned char.

edited Feb 23 '21 at 19:45

answered Feb 23 '21 at 19:38

miken32

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Why i cannot use word, byte on struct in PHP FFI? But char, int, short works?

1 Answers1