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><A
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>Chapter 12. Functions</A
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>Table of Contents</B
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><DT
><A
HREF="functions.html#functions.user-defined"
>User-defined functions</A
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>Function arguments</A
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><TT
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>old_function</TT
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>Variable functions</A
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><A
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>User-defined functions</A
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>&#13;    A function may be defined using syntax such as the following:
 
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>  1&nbsp;
  2&nbsp;function foo ($arg_1, $arg_2, ..., $arg_n) {
  3&nbsp;    echo "Example function.\n";
  4&nbsp;    return $retval;
  5&nbsp;}
  6&nbsp;     </PRE
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>
   </P
><P
>&#13;    Any valid PHP code may appear inside a function, even other
    functions and <A
HREF="oop.html#keyword.class"
>class</A
>
    definitions.
   </P
><P
>&#13;    In PHP3, functions must be defined before they are referenced. No
    such requirement exists in PHP4.
   </P
><P
>&#13;    PHP does not support function overloading, nor is it possible to
    undefine or redefine previously-declared functions.
   </P
><P
>&#13;    PHP3 does not support variable numbers of arguments to functions,
    although default arguments are supported (see <A
HREF="functions.arguments.html#functions.arguments.default"
>Default argument
    values</A
> for more information). PHP4 supports both: see <A
HREF="functions.arguments.html#functions.variable-arg-list"
>Variable-length argument
    lists</A
> and the function references for
    <A
HREF="function.func-num-args.html"
><B
CLASS="function"
>func_num_args()</B
></A
>,
    <A
HREF="function.func-get-arg.html"
><B
CLASS="function"
>func_get_arg()</B
></A
>, and
    <A
HREF="function.func-get-args.html"
><B
CLASS="function"
>func_get_args()</B
></A
> for more information.
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