substruct 1 from a char?

[kgtrip]

hi people

little question,
$a="a";
$a++; will result in $a=b

now I want to do the opposite
$a--; but it gives the same letter

what am I doing wrong?

cheers
Kgtrip

[astericks]

you can only do ++ and -- do integers, not strings.

were you looking for chr ?

[kgtrip]

still how can I move forward and backward in the char values???

[Gaheris]

48 to 57 in chr 0 - 9
65 to 90 in chr A - Z
97 to 122 in chr a - z

[jtresidder]

still how can I move forward and backward in the char values???

$char = 'a';
 
// to add one, use:
$char = chr(ord($char)+1);
 
// to subtract one, use:
$char = chr(ord($char)-1); 

Bear in mind you'll probably want to error-check to catch the ends of the alphabet. Gaheris listed the ascii numbers that the ord function will return for the various characters.

[kgtrip]

OK
that seems ok I'll check it out


Thank's guys