[Solved] can you explain trim and what is doing? [closed]

In simple terms, trim removes whitespace from the beginning or end of a bit of text. For instance, it will turn 'myvalue ' into 'myvalue' and ' tonsofexteriorwhitespace ' into 'tonsofexteriorwhitespace'. Note that it won’t remove whitespace from the interior of the text though, so ' interior spaces remain ' becomes 'interior spaces remain'.

It is often used to compare bits of whose actual content should be equal but may differ in leading or trailing spaces due to file loading/user input.