array_diff (比較元の配列, 比較対象の配列, 比較対象の配列 .... );
$fruit = array("りんご", "みかん", "ぶどう");
$vegetable = array("白菜", "人参", "みかん");
$diff = array_diff($fruit, $vegetable);
while(list($key,$val) = each($diff)) {
print $val. " \n";
}
array_diff()関数のサンプルスクリプト実行結果
