<?
# run this!

$array1 = array(
    0 => 8221874,
    31 => -237983854,
    32 => -178422741,
    33 => -133452210,
    34 => -132423065,
    35 => -86484311,
);

$array2 = array(
    3 => -237983854,
    4 => -178422741,
    6 => -133452210,
    7 => -132423065,
    8 => -86484311,
    11 => 8221874,
);

$array3 = array(
    0 => 8221874,
    1 => 41196856,
    2 => 72211234,
    3 => 176494324,
    4 => 208997856,
    5 => 228939765,
    6 => 330073804,
    7 => 340600386,
    8 => 618210552,
    9 => 762247645,
    10 => 900146471,
    11 => 1091304725,
    12 => 1140421591,
    13 => 1270411028,
    14 => 1478191477,
    15 => 1673874064,
    16 => 1903882621,
    17 => 1999343365,
    18 => 2140576596,
    19 => -2118575707,
    20 => -2017197384,
    21 => -1809590647,
    22 => -1766079050,
    23 => -1637347426,
    24 => -1482531933,
    25 => -1479363897,
    26 => -1391639078,
    27 => -1246350380,
    28 => -1054044604,
    29 => -982856673,
    30 => -447800894,
    31 => -237983854,
    32 => -178422741,
    33 => -133452210,
    34 => -132423065,
    35 => -86484311,
    36 => -17918422,
    37 => -14497841
);

$array4 = array(
    0 => -447800894,
    1 => -418764538,
    2 => -392625909,
    3 => -237983854,
    4 => -178422741,
    5 => -170886411,
    6 => -133452210,
    7 => -132423065,
    8 => -86484311,
    9 => -17918422,
    10 => -14497841,
    11 => 8221874,
    12 => 41196856,
    13 => 72211234,
    14 => 176494324,
    15 => 208997856,
    16 => 228939765,
    17 => 330073804,
    18 => 340600386,
    19 => 447686053,
    20 => 618210552,
    21 => 762247645,
    22 => 900146471,
    23 => 931246825,
    24 => 931347017,
    25 => 1091304725,
    26 => 1098325520,
    27 => 1140421591,
    28 => 1270411028,
    29 => 1283087206,
    30 => 1478191477,
    31 => 1545959313,
    32 => 1546768297,
    33 => 1582484674,
    34 => 1609828347,
    35 => 1652353999,
    36 => 1673874064,
    37 => 1903882621,
    38 => 1999343365,
    39 => 2140576596,
    40 => -2118575707,
    41 => -2092056065,
    42 => -2041328486,
    43 => -2017197384,
    44 => -1815706420,
    45 => -1809590647,
    46 => -1766079050,
    47 => -1682601875,
    48 => -1637347426,
    49 => -1482531933,
    50 => -1479363897,
    51 => -1477072276,
    52 => -1431626038,
    53 => -1391639078,
    54 => -1246350380,
    55 => -1054044604,
    56 => -982856673,
    57 => -904181010
);

echo "array_diff on small arrays:\n";
print_r(array_diff ($array1,$array2));

echo "array_diff on bigger arrays:\n";
print_r(array_diff ($array3,$array4));
?>