PHP 判断数组里的值是否有存在

 
一维数组检测
<?php 

  $a = array('as','ddf','ddf','as','qwe','wer','ert');
  $res = array_unique($a);
  var_dump($res);die;

?> 
二维数组检测 
<?php 

  $arr = array(
    array('a'=>'abc','aa'=>'asdas'),
    array('b'=>'cbd','bb'=>'asd'),
    array('d'=>'abw','cc'=>'aas'),
    array('c'=>'edf','dd'=>'aas'),
  );
  $newarr = array();
  foreach ($arr as $value) {
    foreach ($value as $v) {
      $newarr[] .= $v;
    }    
  }
  $res = array_unique($newarr);
  if (count($newarr) != count($res)) {
      echo "有重复的";
  }else{
      echo "没有重复的";
  }

?>