Can I use numbers in strtolower() ?

[ShawnK]

I am finishing up a login script for my cousins website and I am was going through and I notice I forgot to make it non-case sensitive. So I am just taking the user input and using strtolower() on that string. I am wondering what will happen if someone inputs numbers?

Like if my password is AbC123. Will it return: abc123? or what will happen?

[eoghain]

Yes it will return abc123.

All string to lower does is a simple math equation on the ascii value of each character in your string. If the ascii value of the character falls into the Uppercase range then a certain value is subtracted from it to get the lowercase version of the character. Since numbers don't fall into the Uppercase range they are ignored.

[ShawnK]

Thanks for clarify that for me! :😃