/**          * 给数组排重          * 与array_unique函数的区别：它要求val是字符串，而这个可以是数组/对象          *          * @param unknown_type $arr 要排重的数组          * @param unknown_type $reserveKey 是否保留原来的Key          * @return unknown          */         static function m_ArrayUnique($arr, $reserveKey = false)         {             if (is_array($arr) && !empty($arr))             {                 foreach ($arr as $key => $value)                 {                     $tmpArr[$key] = serialize($value) . '';                 }                 $tmpArr = array_unique($tmpArr);                 $arr = array();                 foreach ($tmpArr as $key => $value)                 {                     if ($reserveKey)                     {                         $arr[$key] = unserialize($value);                     }                     else                     {                         $arr[] = unserialize($value);                     }                 }             }             return $arr;         }

<?php $input = array("a" => "green","", "red","b" => "green", "","blue", "red","c" => "witer","hello","witer"); //$result = array_unique($input); //去除重复元素 $result = a_array_unique($input);   //只留下单一元素 foreach($result as $aa) { echo $aa."<br />"; } function multi_unique($array) {    foreach ($array as $k=>$na)        $new[$k] = serialize($na);    $uniq = array_unique($new);    foreach($uniq as $k=>$ser)        $new1[$k] = unserialize($ser);    return ($new1); } function a_array_unique($array)//写的比较好 {    $out = array();    foreach ($array as $key=>$value) {        if (!in_array($value, $out)) {            $out[$key] = $value;        }    }    return $out; } ?>

function unique_arr($array2D,$stkeep=false,$ndformat=true) {     // 判断是否保留一级数组键 (一级数组键可以为非数字)     if($stkeep) $stArr = array_keys($array2D);     // 判断是否保留二级数组键 (所有二级数组键必须相同)     if($ndformat) $ndArr = array_keys(end($array2D));     //降维,也可以用implode,将一维数组转换为用逗号连接的字符串     foreach ($array2D as $v){         $v = join(",",$v);         $temp[] = $v;     }     //去掉重复的字符串,也就是重复的一维数组     $temp = array_unique($temp);     //再将拆开的数组重新组装     foreach ($temp as $k => $v)     {         if($stkeep) $k = $stArr[$k];         if($ndformat)         {             $tempArr = explode(",",$v);             foreach($tempArr as $ndkey => $ndval) $output[$k][$ndArr[$ndkey]] = $ndval;         }         else $output[$k] = explode(",",$v);     }     return $output; }