W3School TIY Editor
W3School 在线教程
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暗黑模式
<!DOCTYPE html> <html> <body> <?php echo(sin(3) . "<br>"); echo(sin(-3) . "<br>"); echo(sin(0) . "<br>"); echo(sin(M_PI) . "<br>"); echo(sin(M_PI_2)); ?> </body> </html>