源代码:
<HTML> <HEAD></HEAD> <FONT FACE="'Courier New',Verdana, Arial, Helvetica" SIZE=2> <!DOCTYPE html> <html> <body> <FONT COLOR=#ff0000><?php echo(tanh(M_PI_4) . " "); echo(tanh(0.50) . " "); echo(tanh(-0.50) . " "); echo(tanh(5) . " "); echo(tanh(10) . " "); echo(tanh(-5) . " "); echo(tanh(-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>0.65579420263267 0.46211715726001 -0.46211715726001 0.9999092042626 0.99999999587769 -0.9999092042626 -0.99999999587769</FONT> </body> </html> </HTML>