[php-src] Issue #7904: FFI::cast() from pointer returns new value instead of reference.

Issue: https://github.com/php/php-src/issues/7904 Author: userqq ### Description Hi! I'm also not sure it's a bug, but documentation says: FFI::cast() creates a new FFI\CData object, that references the same C data structure, but is associated with a different type. The following code: ```php <?php $val = FFI::new('char[8]'); FFI::memcpy($val, implode('', range('a', 'h')), 8); var_dump($val); $firstInt = FFI::cast('int32_t', $val); var_dump($firstInt); $firstInt->cdata = 0; var_dump($val); $secondInt = FFI::cast('int32_t', $val + 4); var_dump($secondInt); $secondInt->cdata = 0; var_dump($val); ``` Resulted in this output: ``` object(FFI\CData:char[8])#1 (8) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "d" [4]=> string(1) "e" [5]=> string(1) "f" [6]=> string(1) "g" [7]=> string(1) "h" } object(FFI\CData:int32_t)#2 (1) { ["cdata"]=> int(1684234849) } object(FFI\CData:char[8])#1 (8) { [0]=> string(1) "" [1]=> string(1) "" [2]=> string(1) "" [3]=> string(1) "" [4]=> string(1) "e" [5]=> string(1) "f" [6]=> string(1) "g" [7]=> string(1) "h" } object(FFI\CData:int32_t)#4 (1) { ["cdata"]=> int(721424396) } object(FFI\CData:char[8])#1 (8) { [0]=> string(1) "" [1]=> string(1) "" [2]=> string(1) "" [3]=> string(1) "" [4]=> string(1) "e" [5]=> string(1) "f" [6]=> string(1) "g" [7]=> string(1) "h" } ``` But I expected this output instead: ``` object(FFI\CData:char[8])#1 (8) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "d" [4]=> string(1) "e" [5]=> string(1) "f" [6]=> string(1) "g" [7]=> string(1) "h" } object(FFI\CData:int32_t)#2 (1) { ["cdata"]=> int(1684234849) } object(FFI\CData:char[8])#1 (8) { [0]=> string(1) "" [1]=> string(1) "" [2]=> string(1) "" [3]=> string(1) "" [4]=> string(1) "e" [5]=> string(1) "f" [6]=> string(1) "g" [7]=> string(1) "h" } object(FFI\CData:int32_t)#4 (1) { ["cdata"]=> int(721424396) } object(FFI\CData:char[8])#1 (8) { [0]=> string(1) "" [1]=> string(1) "" [2]=> string(1) "" [3]=> string(1) "" [4]=> string(1) "" [5]=> string(1) "" [6]=> string(1) "" [7]=> string(1) "" } ``` ### PHP Version PHP 8.1.1 ### Operating System _No response_