Questions about ord ()

The problem manual of ord () is described as converting to ASCII, but ASCII only has 127 characters. Why can't ord (& quot; I & quot;) still output results ., Only 127 ww.luascii characters are available? The number of extensions should be 256. Ord () is the problem of converting the first character of a string into an ASCII code ord ().
In the manual, it is converted to ASCII, but ASCII only contains 127 characters. Why can ord ("I") still output results.

------ Solution --------------------
Who tell u ascii only 127?

The number of extensions should be 256.

Ord () converts the first character of a string into an ASCII code. Chinese is double byte encoding.
So ord ("I") is only the ASCII code of the first character of "I"
------ Solution --------------------
$ Str = 'I ';
$ O1 = ord ($ str );
$ O2 = ord ($ str [0]);
// Output $ o1 = 230 $ o2 = 230.
The manual is clearly written.
Returns the ASCII value of the first character of the string.