function insert_array( $arr1, $pos, $arr2 )
{
    $totalArr1 = count( $arr1 );
    $totalArr2 = count( $arr2 );
    $newArr = array(); // neues Array erstellen

    if( $pos <= $totalArr1 && $totalArr2 > 0 )
    {
        foreach( $arr1 as $key=>$val )
        {
            $newArr[$key] = $val; // Inhalt vom 1. Array hinzufügen

            if( --$pos == 0 ) // Position erreicht
            {
                foreach( $arr2 as $key2=>$val2 )
                {
                    $newArr[$key2] = $val2; // Inhalt vom 2. Array hinzufügen
                }
            }
        }
    }

    return $newArr;
}