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>func_get_arg</H1
><DIV
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><A
NAME="AEN62769"
></A
><P
> (PHP 4, PHP 5)</P
>func_get_arg -- Return an item from the argument list</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN62772"
></A
><H2
>说明</H2
>mixed <B
CLASS="methodname"
>func_get_arg</B
> ( int arg_num )<BR
></BR
><P
> Gets the specified argument from a user-defined function's argument list.
</P
><P
> This function may be used in conjunction with
<A
HREF="function.func-get-args.html"
><B
CLASS="function"
>func_get_args()</B
></A
> and <A
HREF="function.func-num-args.html"
><B
CLASS="function"
>func_num_args()</B
></A
>
to allow user-defined functions to accept variable-length argument lists.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN62784"
></A
><H2
>参数</H2
><P
> <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>arg_num</CODE
></DT
><DD
><P
> The argument offset. Function arguments are counted starting from
zero.
</P
></DD
></DL
></DIV
>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN62793"
></A
><H2
>返回值</H2
><P
> Returns the specified argument, or <TT
CLASS="constant"
><B
>FALSE</B
></TT
> on error.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN62797"
></A
><H2
>错误／异常</H2
><P
> Generates a warning if called from outside of a user-defined function, or
if <CODE
CLASS="parameter"
>arg_num</CODE
> is greater than the number of arguments
actually passed.
</P
></DIV
><DIV
CLASS="refsect1"
><A
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></A
><H2
>范例</H2
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></A
><P
><B
>例 1. <B
CLASS="function"
>func_get_arg()</B
> example</B
></P
><TABLE
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><TD
><code><font color="#000000">
<font color="#0000BB"><?php<br /></font><font color="#007700">function </font><font color="#0000BB">foo</font><font color="#007700">()<br />{<br /> </font><font color="#0000BB">$numargs </font><font color="#007700">= </font><font color="#0000BB">func_num_args</font><font color="#007700">();<br /> echo </font><font color="#DD0000">"Number of arguments: $numargs<br /></font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br /> if (</font><font color="#0000BB">$numargs </font><font color="#007700">>= </font><font color="#0000BB">2</font><font color="#007700">) {<br /> echo </font><font color="#DD0000">"Second argument is: " </font><font color="#007700">. </font><font color="#0000BB">func_get_arg</font><font color="#007700">(</font><font color="#0000BB">1</font><font color="#007700">) . </font><font color="#DD0000">"<br />\n"</font><font color="#007700">;<br /> }<br />}<br /><br /></font><font color="#0000BB">foo </font><font color="#007700">(</font><font color="#0000BB">1</font><font color="#007700">, </font><font color="#0000BB">2</font><font color="#007700">, </font><font color="#0000BB">3</font><font color="#007700">);<br /></font><font color="#0000BB">?></font>
</font>
</code></TD
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></DIV
></TD
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>
</P
></DIV
><DIV
CLASS="refsect1"
><A
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></A
><H2
>注释</H2
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>Because this function depends on the
current scope to determine parameter details, it cannot be used as a
function parameter. If you must pass this value, assign the results to a
variable, and pass the variable.</P
></BLOCKQUOTE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
This function returns a copy of the passed arguments only, and does not
account for default (non-passed) arguments.
</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN62814"
></A
><H2
>参见</H2
><P
> <P
></P
><TABLE
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><TBODY
><TR
><TD
><A
HREF="function.func-get-args.html"
><B
CLASS="function"
>func_get_args()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.func-num-args.html"
><B
CLASS="function"
>func_num_args()</B
></A
></TD
></TR
></TBODY
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><P
></P
>
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