<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >stream_set_write_buffer</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="Stream Functions" HREF="ref.stream.html"><LINK REL="PREVIOUS" TITLE="stream_set_timeout" HREF="function.stream-set-timeout.html"><LINK REL="NEXT" TITLE="stream_socket_accept" HREF="function.stream-socket-accept.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.stream-set-timeout.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.stream-socket-accept.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.stream-set-write-buffer" ></A >stream_set_write_buffer</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN223618" ></A ><P > (PHP 4 >= 4.3.0, PHP 5)</P >stream_set_write_buffer -- Sets file buffering on the given stream</DIV ><DIV CLASS="refsect1" ><A NAME="AEN223621" ></A ><H2 >Description</H2 >int <B CLASS="methodname" >stream_set_write_buffer</B > ( resource stream, int buffer )<BR ></BR ><P > Output using <A HREF="function.fwrite.html" ><B CLASS="function" >fwrite()</B ></A > is normally buffered at 8K. This means that if there are two processes wanting to write to the same output stream (a file), each is paused after 8K of data to allow the other to write. <B CLASS="function" >stream_set_write_buffer()</B > sets the buffering for write operations on the given filepointer <CODE CLASS="parameter" >stream</CODE > to <CODE CLASS="parameter" >buffer</CODE > bytes. If <CODE CLASS="parameter" >buffer</CODE > is 0 then write operations are unbuffered. This ensures that all writes with <A HREF="function.fwrite.html" ><B CLASS="function" >fwrite()</B ></A > are completed before other processes are allowed to write to that output stream. </P ><P > The function returns 0 on success, or EOF if the request cannot be honored. </P ><P > The following example demonstrates how to use <B CLASS="function" >stream_set_write_buffer()</B > to create an unbuffered stream. <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN223642" ></A ><P ><B >例 1. <B CLASS="function" >stream_set_write_buffer()</B > example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />$fp </font><font color="#007700">= </font><font color="#0000BB">fopen</font><font color="#007700">(</font><font color="#0000BB">$file</font><font color="#007700">, </font><font color="#DD0000">"w"</font><font color="#007700">);<br />if (</font><font color="#0000BB">$fp</font><font color="#007700">) {<br /> </font><font color="#0000BB">stream_set_write_buffer</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">);<br /> </font><font color="#0000BB">fwrite</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#0000BB">$output</font><font color="#007700">);<br /> </font><font color="#0000BB">fclose</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">);<br />}<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ><P > See also <A HREF="function.fopen.html" ><B CLASS="function" >fopen()</B ></A > and <A HREF="function.fwrite.html" ><B CLASS="function" >fwrite()</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.stream-set-timeout.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.stream-socket-accept.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >stream_set_timeout</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.stream.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >stream_socket_accept</TD ></TR ></TABLE ></DIV ></BODY ></HTML >