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php-manual-ro-20051028-1.noarch.rpm

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><H1
><A
NAME="language.functions"
>Cap. 12. Functions</A
></H1
><DIV
CLASS="TOC"
><DL
><DT
><B
>Cuprins</B
></DT
><DT
><A
HREF="language.functions.html#functions.user-defined"
>User-defined functions</A
></DT
><DT
><A
HREF="functions.arguments.html"
>Function arguments</A
></DT
><DT
><A
HREF="functions.returning-values.html"
>Returning values</A
></DT
><DT
><A
HREF="functions.variable-functions.html"
>Variable functions</A
></DT
><DT
><A
HREF="functions.internal.html"
>Internal (built-in) functions</A
></DT
></DL
></DIV
><DIV
CLASS="sect1"
><H1
CLASS="sect1"
><A
NAME="functions.user-defined"
>User-defined functions</A
></H1
><P
>&#13;    A function may be defined using syntax such as the following:
   </P
><P
>&#13;    <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN2968"
></A
><P
><B
>Exemplu 12-1. Pseudo code to demonstrate function uses</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#007700">function </font><font color="#0000BB">foo</font><font color="#007700">(</font><font color="#0000BB">$arg_1</font><font color="#007700">, </font><font color="#0000BB">$arg_2</font><font color="#007700">, </font><font color="#FF8000">/* ..., */ </font><font color="#0000BB">$arg_n</font><font color="#007700">)<br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"Example function.\n"</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;return </font><font color="#0000BB">$retval</font><font color="#007700">;<br />}<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
   </P
><P
>&#13;    Any valid PHP code may appear inside a function, even other
    functions and <A
HREF="language.oop.html#keyword.class"
>class</A
>
    definitions.
   </P
><P
>&#13;    In PHP 3, functions must be defined before they are referenced. No
    such requirement exists in PHP 4. <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>Except</I
></SPAN
> when
    a function is conditionally defined such as shown in the two examples
    below.
   </P
><P
>&#13;    When a function is defined in a conditional manner such as the two
    examples shown.  Its definition must be processed <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>prior</I
></SPAN
>
    to being called.
   </P
><P
>&#13;    <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN2978"
></A
><P
><B
>Exemplu 12-2. Conditional functions</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br />$makefoo </font><font color="#007700">= </font><font color="#0000BB">true</font><font color="#007700">;<br /><br /></font><font color="#FF8000">/* We can't call foo() from here <br />&nbsp;&nbsp;&nbsp;since it doesn't exist yet,<br />&nbsp;&nbsp;&nbsp;but we can call bar() */<br /><br /></font><font color="#0000BB">bar</font><font color="#007700">();<br /><br />if (</font><font color="#0000BB">$makefoo</font><font color="#007700">) {<br />&nbsp;&nbsp;function </font><font color="#0000BB">foo</font><font color="#007700">()<br />&nbsp;&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"I don't exist until program execution reaches me.\n"</font><font color="#007700">;<br />&nbsp;&nbsp;}<br />}<br /><br /></font><font color="#FF8000">/* Now we can safely call foo()<br />&nbsp;&nbsp;&nbsp;since $makefoo evaluated to true */<br /><br /></font><font color="#007700">if (</font><font color="#0000BB">$makefoo</font><font color="#007700">) </font><font color="#0000BB">foo</font><font color="#007700">();<br /><br />function </font><font color="#0000BB">bar</font><font color="#007700">() <br />{<br />&nbsp;&nbsp;echo </font><font color="#DD0000">"I exist immediately upon program start.\n"</font><font color="#007700">;<br />}<br /><br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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></DIV
></TD
></TR
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>
   </P
><P
>&#13;    <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN2982"
></A
><P
><B
>Exemplu 12-3. Functions within functions</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#007700">function </font><font color="#0000BB">foo</font><font color="#007700">() <br />{<br />&nbsp;&nbsp;function </font><font color="#0000BB">bar</font><font color="#007700">() <br />&nbsp;&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"I don't exist until foo() is called.\n"</font><font color="#007700">;<br />&nbsp;&nbsp;}<br />}<br /><br /></font><font color="#FF8000">/* We can't call bar() yet<br />&nbsp;&nbsp;&nbsp;since it doesn't exist. */<br /><br /></font><font color="#0000BB">foo</font><font color="#007700">();<br /><br /></font><font color="#FF8000">/* Now we can call bar(),<br />&nbsp;&nbsp;&nbsp;foo()'s processesing has<br />&nbsp;&nbsp;&nbsp;made it accessible. */<br /><br /></font><font color="#0000BB">bar</font><font color="#007700">();<br /><br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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></TABLE
></DIV
></TD
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>
   </P
><P
>&#13;    PHP does not support function overloading, nor is it possible to
    undefine or redefine previously-declared functions.
   </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Not&#227;: </B
>
     Function names are case-insensitive, though it is usually good form
     to call functions as they appear in their declaration.
    </P
></BLOCKQUOTE
></DIV
><P
>&#13;    PHP 3 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). PHP 4 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.
   </P
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