php去除数组中重复数据

/**
???????? * 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
$input = array("a" => "green","","red","b" => "green","blue","c" => "witer","hello","witer");
//$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;
}
?>
PHP教程

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;
}