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>array_filter</H1
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><P
>    (PHP 4 &#62;= 4.0.6)</P
>array_filter&nbsp;--&nbsp;
     Filters elements of an array using a callback function
    </DIV
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><H2
>Description</H2
>array <B
CLASS="methodname"
>array_filter</B
> ( array input [, callback function])<BR
></BR
><P
>&#13;     <B
CLASS="function"
>array_filter()</B
> returns an array
     containing all the elements of <TT
CLASS="parameter"
><I
>input</I
></TT
>
     filtered according a callback <TT
CLASS="parameter"
><I
>function</I
></TT
>. If the
     <TT
CLASS="parameter"
><I
>input</I
></TT
> is an associative array
     the keys are preserved.
    </P
><P
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><B
>Ejemplo 1. <B
CLASS="function"
>array_filter()</B
> example</B
></P
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><PRE
CLASS="php"
>function odd($var) {
    return ($var % 2 == 1);
}

function even($var) {
    return ($var % 2 == 0);
}

$array1 = array ("a"=&#62;1, "b"=&#62;2, "c"=&#62;3, "d"=&#62;4, "e"=&#62;5);
$array2 = array (6, 7, 8, 9, 10, 11, 12);

echo "Odd :\n";
print_r(array_filter($array1, "odd"));
echo "Even:\n";
print_r(array_filter($array2, "even"));</PRE
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>&#13;       The printout of the program above will be:
       <TABLE
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><PRE
CLASS="php"
>Odd :
Array
(
    [a] =&#62; 1
    [c] =&#62; 3
    [e] =&#62; 5
)
Even:
Array
(
    [0] =&#62; 6
    [2] =&#62; 8
    [4] =&#62; 10
    [6] =&#62; 12
)</PRE
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>
      </P
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>
    </P
><P
>&#13;     Users may not change the array itself from the callback
     function. e.g. Add/delete an element, unset the array that
     <B
CLASS="function"
>array_filter()</B
> is applied to. If the array
     is changed, the behavior of this function is undefined.
    </P
><P
>&#13;     See also <A
HREF="function.array-map.html"
><B
CLASS="function"
>array_map()</B
></A
> and
     <A
HREF="function.array-reduce.html"
><B
CLASS="function"
>array_reduce()</B
></A
>.
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