PHP Fatal error: Call-time pass-by-reference has been removed in includes/acp/acp_styles.php on line 482
and several similar errors when using PHP 5.4
@return documentation is invalid
There is a lot of extra spacing where it shouldn't be
Global variables should not be used in functions other than main()
usort should use array($this, 'sort_styles') instead of 'acp_styles::sort_styles'