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20 years ago
Here is a fairly simple function that replaces while recursing.

<?php
/**
 * array_merge_recursive2()
 *
 * Similar to array_merge_recursive but keyed-valued are always overwritten.
 * Priority goes to the 2nd array.
 *
 * @static yes
 * @public yes
 * @param $paArray1 array
 * @param $paArray2 array
 * @return array
 */
function array_merge_recursive2($paArray1, $paArray2)
{
    if (!is_array($paArray1) or !is_array($paArray2)) { return $paArray2; }
    foreach ($paArray2 AS $sKey2 => $sValue2)
    {
        $paArray1[$sKey2] = array_merge_recursive2(@$paArray1[$sKey2], $sValue2);
    }
    return $paArray1;
}

?>

Examples:
<?php

$array1 = array(
    'liquids' => array(
        'water' => array('cold', 'fizzy', 'clean')
        ,'beer' => 'warm'
    )
);

$array2 = array(
    'liquids' => array(
        'water' => 'hot'
        ,'milk' => 'wet'
    )
);

$result1 = array_merge_recursive2($array1, $array2);
$result2 = array_merge_recursive2($array2, $array1);
?>

Result 1 is:
Array
(
    [liquids] => Array
        (
            [water] => hot
            [beer] => warm
            [milk] => wet
        )
)

Result 2 is:
Array
(
    [liquids] => Array
        (
            [water] => Array
                (
                    [0] => cold
                    [1] => fizzy
                    [2] => clean
                )

            [milk] => wet
            [beer] => warm
        )
)
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