php怎么去除数组中的重复值

array_unique(array)

<?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;
} 
?>