$MyOriginalString = "Hello World";
$HowManyLetters = strlen($MyOriginalString);
$TheFirstChar = substr($MyOriginalString, 1,1);
$TheRemainOfString = substr($MyOriginalString, 2, $HowManyLetters);
$MyOriginalString = "<B>".$TheFirstChar."</B>".$TheRemainOfString;
Basically you can chop the string anyway you like with the
substr function.