Description:
------------
return 0 value when there's no specified 0 value in array

Reproduce code:
---------------
    <?php
    $array1 = array(?php?, ?java?, ?ruby?, ?asp?);
    $array2 = array(?php? => ?PHP.net?, ?java? => ?java.com?, 0 => ?javascript?, 1 => ?actionscript?);

    foreach ($array2 as $key => $value) {
    if ( in_array($key, $array1) ) {
    print ?in array: $key <br />?;
    } else {
    print ?not in array: $key <br />?;
    } # end if

    } # end foreach

    ?>

Expected result:
----------------
in array: php
in array: java
not in array: 0
not in array: 1

Actual result:
--------------
in array: php
in array: java
in array: 0
not in array: 1