一维数组的重复项：使用array_unique函数即可，使用实例如下：
$aa=array("apple","banana","pear","apple","wail","watermalon");
$bb=array_unique($aa);
print_r($bb);
?>
结果如下：Array ( [0] => apple [1] => banana [2] => pear [4] => wail [5] => watermalon ) 。