Can't get str_replace() to strip out spaces in a PHP string

Question

Hi, I am getting a PHP string which I need to strip the spaces out of. I have used the following code but when I echo $classname it just displays the string sti

Answer 1

Try to add u-parameter for regex-pattern, because a string can have UTF-8 encoding:

$classname  =  preg_replace('/\s+/u', '', $fieldname);