源代码:
<HTML> <HEAD></HEAD> <FONT FACE="'Courier New',Verdana, Arial, Helvetica" SIZE=2> <!DOCTYPE html> <html> <body> <FONT COLOR=#ff0000><?php echo(atan(0.50) . " "); echo(atan(-0.50) . " "); echo(atan(5) . " "); echo(atan(-5) . " "); echo(atan(100) . " "); echo(atan(-100)); ?></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>0.46364760900081 -0.46364760900081 1.373400766945 -1.373400766945 1.5607966601082 -1.5607966601082</FONT> </body> </html> </HTML>