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源代码
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<html> <body> <?php echo(asin(0.64) . "<br>"); echo(asin(-0.4) . "<br>"); echo(asin(0) . "<br>"); echo(asin(-1) . "<br>"); echo(asin(1) . "<br>"); echo(asin(2)); ?> </body> </html>
运行结果
<!DOCTYPE html> <html> <body> 0.69449826562656<br>-0.41151684606749<br>0<br>-1.5707963267949<br>1.5707963267949<br>NAN </body> </html>