Question

I cannot use strtolower as it affects all characters. Should I use some sort of regular expression?

I’m getting a string which is a product code. I want to use this product code as a search key in a different place with the first letter made lowercase.

Answer 1

Just do:

$str = "STACK overflow";
$str[0] = strtolower($str[0]); // prints sTACK overflow

And if you are using 5.3 or later, you can do:

$str = lcfirst($str);