Replacing Spaces with Underscores

Question

I have a PHP Script that users will enter a name like: Alex_Newton,

However, some users will use a space rather than an underscore, so my question is:

Answer 1

str_replace - it is evident solution. But sometimes you need to know what exactly the spaces there are. I have a problem with spaces from csv file.

There were two chars but one of them was 0160 (0x0A0) and other was invisible (0x0C2)

my final solution:

$str = preg_replace('/\xC2\xA0+/', '', $str);

I found the invisible symbol from HEX viewer from mc (midnight viewer - F3 - F9)