\n LF / 0x0A(10) in ASCII 0x0D(13) in \r CR or ASCII \t horizontal TAB -ht or 0x09 (9) in ASCII \ \ the backslash Operator \ $dollars \ “double quotation marks \ ‘single quotation marks --------------------- Windows: \ r \ n Linux, Unix: \ n

PHP functions like response.end in asp are exit () or die () Determine the number function is_numeric()