<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >dio_read</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="Direct IO Functions" HREF="ref.dio.html"><LINK REL="PREVIOUS" TITLE="dio_open" HREF="function.dio-open.html"><LINK REL="NEXT" TITLE="dio_seek" HREF="function.dio-seek.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.dio-open.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.dio-seek.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.dio-read" ></A >dio_read</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN36270" ></A ><P > (PHP 4 >= 4.2.0, PHP 5 <= 5.0.4)</P >dio_read -- Reads bytes from a file descriptor</DIV ><DIV CLASS="refsect1" ><A NAME="AEN36273" ></A ><H2 >说明</H2 >string <B CLASS="methodname" >dio_read</B > ( resource fd [, int len] )<BR ></BR ><P > The function <B CLASS="function" >dio_read()</B > reads and returns <CODE CLASS="parameter" >len</CODE > bytes from file with descriptor <CODE CLASS="parameter" >fd</CODE >. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN36288" ></A ><H2 >参数</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >fd</CODE ></DT ><DD ><P > The file descriptor returned by <A HREF="function.dio-open.html" ><B CLASS="function" >dio_open()</B ></A >. </P ></DD ><DT ><CODE CLASS="parameter" >len</CODE ></DT ><DD ><P > The number of bytes to read. If not specified, <B CLASS="function" >dio_read()</B > reads 1K sized block. </P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN36304" ></A ><H2 >返回值</H2 ><P > The bytes read from <CODE CLASS="parameter" >fd</CODE >. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN36308" ></A ><H2 >参见</H2 ><P > <P ></P ><TABLE BORDER="0" ><TBODY ><TR ><TD ><A HREF="function.dio-write.html" ><B CLASS="function" >dio_write()</B ></A ></TD ></TR ></TBODY ></TABLE ><P ></P > </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.dio-open.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.dio-seek.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >dio_open</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.dio.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >dio_seek</TD ></TR ></TABLE ></DIV ></BODY ></HTML >