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>Phar::offsetExists</H1
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><P
>    (no version information, might be only in CVS)</P
>Phar::offsetExists&nbsp;--&nbsp;determines whether a file exists in the phar</DIV
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NAME="AEN179222"
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><H2
>说明</H2
>bool <B
CLASS="methodname"
>Phar::offsetExists</B
> ( string offset )<BR
></BR
><P
>&#13;   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
>&#13;   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
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>offset</CODE
></DT
><DD
><P
>&#13;       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
>&#13;   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
>&#13;   <TABLE
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><P
><B
>例 1. A <B
CLASS="function"
>Phar::offsetExists()</B
> example</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?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">?&gt;</font>
</font>
</code></TD
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><P
>上例将输出：</P
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><PRE
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>bool(true)
bool(false)</PRE
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>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN179257"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
><TABLE
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><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
>
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