"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 $aa."
";}function multi_unique($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;}

去除二重数组：

function a_array_unique($array)//写的比较好{   $word = $out = array();   foreach ($array as $key=>$value) {       if (!in_array($value['word'], $word)){           $out[$key] = $value;           $word[$key] = $value['word'];       }   }   return $out;}