源代码:
<HTML> <HEAD></HEAD> <FONT FACE="'Courier New',Verdana, Arial, Helvetica" SIZE=2> <!DOCTYPE html> <html> <body> <FONT COLOR=#ff0000><?php echo(tan(M_PI_4) . " "); echo(tan(0.50) . " "); echo(tan(-0.50) . " "); echo(tan(5) . " "); echo(tan(10) . " "); echo(tan(-5) . " "); echo(tan(-10)); ?></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>1 0.54630248984379 -0.54630248984379 -3.3805150062466 0.64836082745909 3.3805150062466 -0.64836082745909</FONT> </body> </html> </HTML>