<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >bccomp</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="BC math 高精度数学函数" HREF="ref.bc.html"><LINK REL="PREVIOUS" TITLE="bcadd" HREF="function.bcadd.html"><LINK REL="NEXT" TITLE="bcdiv" HREF="function.bcdiv.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.bcadd.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.bcdiv.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.bccomp" ></A >bccomp</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN14050" ></A ><P > (PHP 3, PHP 4, PHP 5)</P >bccomp -- Compare two arbitrary precision numbers</DIV ><DIV CLASS="refsect1" ><A NAME="AEN14053" ></A ><H2 >说明</H2 >int <B CLASS="methodname" >bccomp</B > ( string left_operand, string right_operand [, int scale] )<BR ></BR ><P > Compares the <CODE CLASS="parameter" >left_operand</CODE > to the <CODE CLASS="parameter" >right_operand</CODE > and returns the result as an integer. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN14070" ></A ><H2 >参数</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >left_operand</CODE ></DT ><DD ><P > The left operand, as a string. </P ></DD ><DT ><CODE CLASS="parameter" >right_operand</CODE ></DT ><DD ><P > The right operand, as a string. </P ></DD ><DT ><CODE CLASS="parameter" >scale</CODE ></DT ><DD ><P > The optional <CODE CLASS="parameter" >scale</CODE > parameter is used to set the number of digits after the decimal place which will be used in the comparison. </P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN14090" ></A ><H2 >返回值</H2 ><P > Returns 0 if the two operands are equal, 1 if the <CODE CLASS="parameter" >left_operand</CODE > is larger than the <CODE CLASS="parameter" >right_operand</CODE >, -1 otherwise. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN14095" ></A ><H2 >范例</H2 ><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN14097" ></A ><P ><B >例 1. <B CLASS="function" >bccomp()</B > example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /><br /></font><font color="#007700">echo </font><font color="#0000BB">bccomp</font><font color="#007700">(</font><font color="#DD0000">'1'</font><font color="#007700">, </font><font color="#DD0000">'2'</font><font color="#007700">) . </font><font color="#DD0000">"\n"</font><font color="#007700">; </font><font color="#FF8000">// -1<br /></font><font color="#007700">echo </font><font color="#0000BB">bccomp</font><font color="#007700">(</font><font color="#DD0000">'1.00001'</font><font color="#007700">, </font><font color="#DD0000">'1'</font><font color="#007700">, </font><font color="#0000BB">3</font><font color="#007700">); </font><font color="#FF8000">// 0<br /></font><font color="#007700">echo </font><font color="#0000BB">bccomp</font><font color="#007700">(</font><font color="#DD0000">'1.00001'</font><font color="#007700">, </font><font color="#DD0000">'1'</font><font color="#007700">, </font><font color="#0000BB">5</font><font color="#007700">); </font><font color="#FF8000">// 1<br /><br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE ></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.bcadd.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.bcdiv.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >bcadd</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.bc.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >bcdiv</TD ></TR ></TABLE ></DIV ></BODY ></HTML >