php array deduplication

$aa=array("apple","banana","pear","apple","wail","watermalon");
 $bb=array_unique($aa);
 print_r($bb);//Array ( [0] => apple [1] => banana [2] => pear [4] => wail [5] => watermalon

$aa = array(
            array('id' => 123, 'name' => '张三'),
            array('id' => 123, 'name' => '李四'),
            array('id' => 124, 'name' => '王五'),
            array('id' => 125, 'name' => '赵六'),
            array('id' => 126, 'name' => '赵六')
            );
//需求，id 不能重复functionassoc_unique($arr, $key){$tmp_arr = array();
        foreach($arras$k => $v){
            //搜索$v[$key]是否在$tmp_arr数组中存在，若存在返回trueif(in_array($v[$key], $tmp_arr)){
                 unset($arr[$k]);
            }else {
                $tmp_arr[] = $v[$key];
            }
        }
        sort($arr); //sort函数对数组进行排序return$arr;
}
$key = 'id';
assoc_unique(&$aa, $key);
print_r($aa);
//Array ( [0] => Array ( [id] => 123 [name] => 张三 ) [1] => Array ( [id] => 124 [name] => 王五 ) [2] => Array ( [id] => 125 [name] => 赵六 ) [3] => Array ( [id] => 126 [name] => 赵六 ) )

$aa = array(
            array('id' => 123, 'name' => '张三'),
            array('id' => 123, 'name' => '李四'),
            array('id' => 124, 'name' => '王五'),
            array('id' => 123, 'name' => '李四'),
            array('id' => 126, 'name' => '赵六')
            );
functionarray_unique_fb($array2D){foreach ($array2Das$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 ($tempas$k => $v){
                    $temp[$k] = explode(",",$v);   //再将拆开的数组重新组装
                }
                return$temp;
            }
            $bb=array_unique_fb($aa);
            print_r($bb);
            //Array ( [0] => Array ( [0] => 123 [1] => 张三 ) [1] => Array ( [0] => 123 [1] => 李四 ) [2] => Array ( [0] => 124 [1] => 王五 ) [4] => Array ( [0] => 126 [1] => 赵六 ) )