php-functions

1. check if windows
   
2. truncate string to certain length
   
3. check if HTTPS
   
4. text to BBCODE
   
5. check if file is a image
   
6. DOB to age
   
7. random string
   
8. force file download
   
9. make http links clickable
   
10. replace multiple whitespaces with 1 space

NOTE: not all functions are made by me

remove eregi