<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >sin</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="PHP 手册" HREF="index.html"><LINK REL="UP" TITLE="Math 数学函数" HREF="ref.math.html"><LINK REL="PREVIOUS" TITLE="round" HREF="function.round.html"><LINK REL="NEXT" TITLE="sinh" HREF="function.sinh.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP 手册</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.round.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.sinh.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.sin" ></A >sin</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN109095" ></A ><P > (PHP 3, PHP 4, PHP 5)</P >sin -- 正弦</DIV ><DIV CLASS="refsect1" ><A NAME="AEN109098" ></A ><H2 >说明</H2 >float <B CLASS="methodname" >sin</B > ( float arg )<BR ></BR ><P > <B CLASS="function" >sin()</B > 返回参数 <CODE CLASS="parameter" >arg</CODE > 的正弦值。参数 <CODE CLASS="parameter" >arg</CODE > 的单位为弧度。 </P ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN109111" ></A ><P ><B >例 1. <B CLASS="function" >sin()</B ></B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /><br /></font><font color="#FF8000">// 返回值的精度由 &php.ini; 中的 precision 指示确定<br /></font><font color="#007700">echo </font><font color="#0000BB">sin</font><font color="#007700">(</font><font color="#0000BB">deg2rad</font><font color="#007700">(</font><font color="#0000BB">60</font><font color="#007700">)); </font><font color="#FF8000">// 0.866025403 ...<br /></font><font color="#007700">echo </font><font color="#0000BB">sin</font><font color="#007700">(</font><font color="#0000BB">60</font><font color="#007700">); </font><font color="#FF8000">// -0.304810621 ...<br /><br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ><P > 参见: <A HREF="function.asin.html" ><B CLASS="function" >asin()</B ></A >、 <A HREF="function.cos.html" ><B CLASS="function" >cos()</B ></A >、 <A HREF="function.tan.html" ><B CLASS="function" >tan()</B ></A >和 <A HREF="function.deg2rad.html" ><B CLASS="function" >deg2rad()</B ></A >。 </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.round.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >起始页</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.sinh.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >round</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.math.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >sinh</TD ></TR ></TABLE ></DIV ></BODY ></HTML >