php 数组去重方法小结

 <?php
   $aa=array("apple","banana","pear","apple","wail","watermalon");
   $bb=array_unique($aa);
   print_r($bb);
?>

<?php
function assoc_unique($arr, $key)
 {
   $tmp_arr = array();
   foreach($arr as $k => $v)
  {
     if(in_array($v[$key], $tmp_arr))//搜索$v[$key]是否在$tmp_arr数组中存在，若存在返回true
    {
       unset($arr[$k]);
    }
  else {
      $tmp_arr[] = $v[$key];
    }
  }
sort($arr); //sort函数对数组进行排序
return $arr;
}

$aa = array(
array('id' => 123, 'name' => '张三'),
array('id' => 123, 'name' => '李四'),
array('id' => 124, 'name' => '王五'),
array('id' => 125, 'name' => '赵六'),
array('id' => 126, 'name' => '赵六')
);
$key = 'id';
assoc_unique(&$aa, $key);
print_r($aa);
?>

<?php
function array_unique_fb($array2D){
     foreach ($array2D as $v){
         $v = join(",",$v); //降维,也可以用implode,将一维数组转换为用逗号连接的字符串
         $temp[] = $v;
     }
     $temp = array_unique($temp);    //去掉重复的字符串,也就是重复的一维数组
    foreach ($temp as $k => $v){
        $temp[$k] = explode(",",$v);   //再将拆开的数组重新组装
    }
    return $temp;
}

$aa = array(
array('id' => 123, 'name' => '张三'),
array('id' => 123, 'name' => '李四'),
array('id' => 124, 'name' => '王五'),
array('id' => 123, 'name' => '李四'),
array('id' => 126, 'name' => '赵六')
);
$bb=array_unique_fb($aa);
print_r($bb)
?>