源代码:
<HTML> <HEAD></HEAD> <FONT FACE="'Courier New',Verdana, Arial, Helvetica" SIZE=2> <!DOCTYPE html> <html> <body> <FONT COLOR=#ff0000><?php $d=cal_days_in_month(CAL_GREGORIAN,2,1965); echo "There was $d days in February 1965. "; $d=cal_days_in_month(CAL_GREGORIAN,2,2004); echo "There was $d days in February 2004."; ?></FONT> </body> </html> </HTML>
运行结果：
<HTML> <HEAD></HEAD> <FONT FACE="'Courier New',Verdana, Arial, Helvetica" SIZE=2> <!DOCTYPE html> <html> <body> <FONT COLOR=#ff0000>There was 28 days in February 1965. There was 29 days in February 2004.</FONT> </body> </html> </HTML>