当源是一个整数而目标是一个字符串时，什么是Pascal的Move的PHP等价物？ [关闭]

Question

I am converting some Pascal to PHP. Inside a function of return type AnsiString there are the following lines of code:

SetLength(Result, 3);
Move(I, Result[1], Length(Result));

I is a Longint with value 5051253. What ends up in Result is 'u'#19'M'.

How do I replicate that in PHP? What is it doing? I know Move reads bytes from I and puts them in Result.

Answer 1

function low3bytes( $I) {
  return chr(         $I           % 256)
       . chr( ((int) ($I /   256)) % 256)
       . chr( ((int) ($I / 65536)) % 256);
}

Caveat: Not tested.