<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >fmod</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="floor" HREF="function.floor.html"><LINK REL="NEXT" TITLE="getrandmax" HREF="function.getrandmax.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.floor.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.getrandmax.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.fmod" ></A >fmod</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN108490" ></A ><P > (PHP 4 >= 4.2.0, PHP 5)</P >fmod -- 返回除法的浮点数余数</DIV ><DIV CLASS="refsect1" ><A NAME="AEN108493" ></A ><H2 >说明</H2 >float <B CLASS="methodname" >fmod</B > ( float x, float y )<BR ></BR ><P > 返回被除数(<CODE CLASS="parameter" >x</CODE >)除以除数(<CODE CLASS="parameter" >y</CODE >)所得的浮点数余数。余数(<CODE CLASS="varname" >r</CODE >)的定义是:x = i * y + r,其中 <CODE CLASS="varname" >i</CODE > 是整数。如果 <CODE CLASS="parameter" >y</CODE > 是非零值,则 <CODE CLASS="varname" >r</CODE > 和 <CODE CLASS="parameter" >x</CODE > 的符号相同并且其数量值小于 <CODE CLASS="parameter" >y</CODE >。 </P ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN108514" ></A ><P ><B >例 1. 使用 <B CLASS="function" >fmod()</B ></B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />$x </font><font color="#007700">= </font><font color="#0000BB">5.7</font><font color="#007700">;<br /></font><font color="#0000BB">$y </font><font color="#007700">= </font><font color="#0000BB">1.3</font><font color="#007700">;<br /></font><font color="#0000BB">$r </font><font color="#007700">= </font><font color="#0000BB">fmod</font><font color="#007700">(</font><font color="#0000BB">$x</font><font color="#007700">, </font><font color="#0000BB">$y</font><font color="#007700">);<br /></font><font color="#FF8000">// $r equals 0.5, because 4 * 1.3 + 0.5 = 5.7<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </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.floor.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.getrandmax.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >floor</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" >getrandmax</TD ></TR ></TABLE ></DIV ></BODY ></HTML >