<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Phar::offsetExists</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="Phar archive stream and classes" HREF="ref.phar.html"><LINK REL="PREVIOUS" TITLE="Phar::mapPhar" HREF="function.phar-mapphar.html"><LINK REL="NEXT" TITLE="Phar::offsetGet" HREF="function.phar-offsetget.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.phar-mapphar.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.phar-offsetget.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.phar-offsetexists" ></A >Phar::offsetExists</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN179219" ></A ><P > (no version information, might be only in CVS)</P >Phar::offsetExists -- determines whether a file exists in the phar</DIV ><DIV CLASS="refsect1" ><A NAME="AEN179222" ></A ><H2 >说明</H2 >bool <B CLASS="methodname" >Phar::offsetExists</B > ( string offset )<BR ></BR ><P > This is an implementation of the <SPAN CLASS="interface" >ArrayAccess</SPAN > interface allowing direct manipulation of the contents of a Phar archive using array access brackets. </P ><P > offsetExists() is called whenever <A HREF="function.isset.html" ><B CLASS="function" >isset()</B ></A > is called. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN179234" ></A ><H2 >参数</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >offset</CODE ></DT ><DD ><P > The filename (relative path) to look for in a Phar. </P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN179243" ></A ><H2 >返回值</H2 ><P > Returns <TT CLASS="constant" ><B >TRUE</B ></TT > if the file exists within the phar, or <TT CLASS="constant" ><B >FALSE</B ></TT > if not. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN179248" ></A ><H2 >范例</H2 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN179251" ></A ><P ><B >例 1. A <B CLASS="function" >Phar::offsetExists()</B > example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />$p </font><font color="#007700">= new </font><font color="#0000BB">Phar</font><font color="#007700">(</font><font color="#0000BB">dirname</font><font color="#007700">(</font><font color="#0000BB">__FILE__</font><font color="#007700">) . </font><font color="#DD0000">'/my.phar'</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#DD0000">'my.phar'</font><font color="#007700">);<br /></font><font color="#0000BB">$p</font><font color="#007700">[</font><font color="#DD0000">'firstfile.txt'</font><font color="#007700">] = </font><font color="#DD0000">'first file'</font><font color="#007700">;<br /></font><font color="#0000BB">$p</font><font color="#007700">[</font><font color="#DD0000">'secondfile.txt'</font><font color="#007700">] = </font><font color="#DD0000">'second file'</font><font color="#007700">;<br /></font><font color="#FF8000">// the next set of lines call offsetExists() indirectly<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(isset(</font><font color="#0000BB">$p</font><font color="#007700">[</font><font color="#DD0000">'firstfile.txt'</font><font color="#007700">]));<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(isset(</font><font color="#0000BB">$p</font><font color="#007700">[</font><font color="#DD0000">'nothere.txt'</font><font color="#007700">]));<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ><P >上例将输出:</P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><PRE CLASS="screen" >bool(true) bool(false)</PRE ></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN179257" ></A ><H2 >参见</H2 ><P > <P ></P ><TABLE BORDER="0" ><TBODY ><TR ><TD ><A HREF="function.phar-offsetget.html" ><B CLASS="function" >Phar::offsetGet()</B ></A ></TD ></TR ><TR ><TD ><A HREF="function.phar-offsetset.html" ><B CLASS="function" >Phar::offsetSet()</B ></A ></TD ></TR ><TR ><TD ><A HREF="function.phar-offsetunset.html" ><B CLASS="function" >Phar::offsetUnset()</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.phar-mapphar.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.phar-offsetget.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Phar::mapPhar</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.phar.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Phar::offsetGet</TD ></TR ></TABLE ></DIV ></BODY ></HTML >