<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >fprintf</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="String 字符串处理函数" HREF="ref.strings.html"><LINK REL="PREVIOUS" TITLE="explode" HREF="function.explode.html"><LINK REL="NEXT" TITLE="get_html_translation_table" HREF="function.get-html-translation-table.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.explode.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.get-html-translation-table.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.fprintf" ></A >fprintf</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN224984" ></A ><P > (PHP 5)</P >fprintf -- Write a formatted string to a stream</DIV ><DIV CLASS="refsect1" ><A NAME="AEN224987" ></A ><H2 >Description</H2 >int <B CLASS="methodname" >fprintf</B > ( resource handle, string format [, mixed args [, mixed ...]] )<BR ></BR ><P > Write a string produced according to <CODE CLASS="parameter" >format</CODE > to the stream resource specified by <CODE CLASS="parameter" >handle</CODE >. <CODE CLASS="parameter" >format</CODE > is described in the documentation for <A HREF="function.sprintf.html" ><B CLASS="function" >sprintf()</B ></A >. </P ><P > Returns the length of the outputted string. </P ><P > See also: <A HREF="function.printf.html" ><B CLASS="function" >printf()</B ></A >, <A HREF="function.sprintf.html" ><B CLASS="function" >sprintf()</B ></A >, <A HREF="function.sscanf.html" ><B CLASS="function" >sscanf()</B ></A >, <A HREF="function.fscanf.html" ><B CLASS="function" >fscanf()</B ></A >, <A HREF="function.vsprintf.html" ><B CLASS="function" >vsprintf()</B ></A >, and <A HREF="function.number-format.html" ><B CLASS="function" >number_format()</B ></A >. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN225017" ></A ><H2 >Examples</H2 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN225020" ></A ><P ><B >例 1. <B CLASS="function" >fprintf()</B >: zero-padded integers</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /></font><font color="#007700">if (!(</font><font color="#0000BB">$fp </font><font color="#007700">= </font><font color="#0000BB">fopen</font><font color="#007700">(</font><font color="#DD0000">'date.txt'</font><font color="#007700">, </font><font color="#DD0000">'w'</font><font color="#007700">)))<br /> return;<br /><br /></font><font color="#0000BB">fprintf</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">"%04d-%02d-%02d"</font><font color="#007700">, </font><font color="#0000BB">$year</font><font color="#007700">, </font><font color="#0000BB">$month</font><font color="#007700">, </font><font color="#0000BB">$day</font><font color="#007700">);<br /></font><font color="#FF8000">// will write the formatted ISO date to date.txt<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN225024" ></A ><P ><B >例 2. <B CLASS="function" >fprintf()</B >: formatting currency</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /></font><font color="#007700">if (!(</font><font color="#0000BB">$fp </font><font color="#007700">= </font><font color="#0000BB">fopen</font><font color="#007700">(</font><font color="#DD0000">'currency.txt'</font><font color="#007700">, </font><font color="#DD0000">'w'</font><font color="#007700">)))<br /> return;<br /><br /></font><font color="#0000BB">$money1 </font><font color="#007700">= </font><font color="#0000BB">68.75</font><font color="#007700">;<br /></font><font color="#0000BB">$money2 </font><font color="#007700">= </font><font color="#0000BB">54.35</font><font color="#007700">;<br /></font><font color="#0000BB">$money </font><font color="#007700">= </font><font color="#0000BB">$money1 </font><font color="#007700">+ </font><font color="#0000BB">$money2</font><font color="#007700">;<br /></font><font color="#FF8000">// echo $money will output "123.1";<br /></font><font color="#0000BB">$len </font><font color="#007700">= </font><font color="#0000BB">fprintf</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">'%01.2f'</font><font color="#007700">, </font><font color="#0000BB">$money</font><font color="#007700">);<br /></font><font color="#FF8000">// will write "123.10" to currency.txt<br /><br /></font><font color="#007700">echo </font><font color="#DD0000">"wrote $len bytes to currency.txt"</font><font color="#007700">;<br /></font><font color="#FF8000">// use the return value of fprintf to determine how many bytes we wrote<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 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