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><H1
><A
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>array_walk</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN8316"
></A
><P
>    (PHP 3&#62;= 3.0.3, PHP 4 )</P
>array_walk&nbsp;--&nbsp;
     Apply a user function to every member of an array
    </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN8319"
></A
><H2
>Description</H2
>int <B
CLASS="methodname"
>array_walk</B
> ( array array, callback function [, mixed userdata])<BR
></BR
><P
>&#13;     Applies the user-defined function <TT
CLASS="parameter"
><I
>function</I
></TT
> to each
     element of the <TT
CLASS="parameter"
><I
>array</I
></TT
> array. Typically, 
     <TT
CLASS="parameter"
><I
>function</I
></TT
> takes on two parameters.
     The <TT
CLASS="parameter"
><I
>array</I
></TT
> parameter's value being the first, and
     the key/index second. If the optional <TT
CLASS="parameter"
><I
>userdata</I
></TT
>
     parameter is supplied, it will be passed as the third parameter to
     the callback <TT
CLASS="parameter"
><I
>function</I
></TT
>.
    </P
><P
>&#13;     If function <TT
CLASS="parameter"
><I
>function</I
></TT
> requires more parameters than 
     given to it, an error of level <A
HREF="ref.errorfunc.html#errorfunc.constants"
>&#13;     E_WARNING</A
> will be generated each time <B
CLASS="function"
>array_walk()</B
>
     calls <TT
CLASS="parameter"
><I
>function</I
></TT
>. These warnings may be suppressed by 
     prepending the PHP error operator 
     <A
HREF="language.operators.errorcontrol.html"
>@</A
> to the 
     <B
CLASS="function"
>array_walk()</B
> call, or by using 
     <A
HREF="function.error-reporting.html"
><B
CLASS="function"
>error_reporting()</B
></A
>.
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
      If <TT
CLASS="parameter"
><I
>function</I
></TT
> needs to be working with the
      actual values of the array, specify the first parameter of
      <TT
CLASS="parameter"
><I
>function</I
></TT
> as a 
      <A
HREF="language.references.html"
>reference</A
>. Then,
      any changes made to those elements will be made in the 
      original array itself.
     </P
></BLOCKQUOTE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
      Passing the key and userdata to <TT
CLASS="parameter"
><I
>function</I
></TT
> was
      added in 4.0.0
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     <B
CLASS="function"
>array_walk()</B
> is not affected by the internal
     array pointer of <TT
CLASS="parameter"
><I
>array</I
></TT
>.  <B
CLASS="function"
>&#13;     array_walk()</B
> will walk through the entire array 
     regardless of pointer position.  To reset the pointer, use 
     <A
HREF="function.reset.html"
><B
CLASS="function"
>reset()</B
></A
>.  In PHP 3, 
     <B
CLASS="function"
>array_walk()</B
> resets the pointer.
    </P
><P
>&#13;     Users may not change the array itself from the callback
     function. e.g. Add/delete elements, unset elements, etc.  If
     the array that <B
CLASS="function"
>array_walk()</B
> is applied to 
     is changed, the behavior of this function is undefined, and
     unpredictable.
    </P
><P
>&#13;     <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN8365"
></A
><P
><B
>Example 1. <B
CLASS="function"
>array_walk()</B
> example</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="php"
>&#60;?php
$fruits = array ("d"=&#62;"lemon", "a"=&#62;"orange", "b"=&#62;"banana", "c"=&#62;"apple");

function test_alter (&#38;$item1, $key, $prefix) {
    $item1 = "$prefix: $item1";
}

function test_print ($item2, $key) {
    echo "$key. $item2&#60;br&#62;\n";
}

echo "Before ...:\n";
array_walk ($fruits, 'test_print');

array_walk ($fruits, 'test_alter', 'fruit');
echo "... and after:\n";

array_walk ($fruits, 'test_print');
?&#62;</PRE
></TD
></TR
></TABLE
><P
>&#13;       The printout of the program above will be:
       <TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="php"
>Before ...:
d. lemon
a. orange
b. banana
c. apple
... and after:
d. fruit: lemon
a. fruit: orange
b. fruit: banana
c. fruit: apple</PRE
></TD
></TR
></TABLE
>
      </P
></DIV
></TD
></TR
></TABLE
>
    </P
><P
>&#13;     See also <A
HREF="function.list.html"
><B
CLASS="function"
>list()</B
></A
>, 
     <A
HREF="control-structures.foreach.html"
>foreach</A
>, 
     <A
HREF="function.each.html"
><B
CLASS="function"
>each()</B
></A
>, and <A
HREF="function.call-user-func-array.html"
><B
CLASS="function"
>call_user_func_array()</B
></A
>.
    </P
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