源代码:
<HTML> <HEAD></HEAD> <FONT FACE="'Courier New',Verdana, Arial, Helvetica" SIZE=2> <!DOCTYPE html> <html> <body> <FONT COLOR=#ff0000><?php echo hypot(3,4) . " "; echo hypot(4,6) . " "; echo hypot(1,3) . " "; echo sqrt(3*3+4*4); ?></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>5 7.211102550928 3.1622776601684 5</FONT> </body> </html> </HTML>