源代码:
<HTML> <HEAD></HEAD> <FONT FACE="'Courier New',Verdana, Arial, Helvetica" SIZE=2> <!DOCTYPE html> <html> <body> <FONT COLOR=#ff0000><?php echo(asin(0.64) . " "); echo(asin(-0.4) . " "); echo(asin(0) . " "); echo(asin(-1) . " "); echo(asin(1) . " "); echo(asin(2)); ?></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>0.69449826562656 -0.41151684606749 0 -1.5707963267949 1.5707963267949 NAN</FONT> </body> </html> </HTML>