Question

我尝试将来自多个查询的结果组合在一起并将它们放入数组中。我发现存在一些重复。我想要做的是保留第一条记录，如果存在重复，则删除以下相同的记录。我想写一个函数来过滤数组并删除重复。任何人都可以帮助我吗？感谢

array(4) {
  [0]=>
  array(14) {
    ["user_id"]=>
    string(7) "2620613"
    ["first_name"]=>
    string(5) "Susan"
    ["last_name"]=>
    string(9) "Alexander"
    ["client"]=>
    string(7) "Pro"
    ["ssn"]=>
    string(9) "4234324"
    ["hiredate"]=>
    string(10) "2008-04-11"
    ["hra_id"]=>
    string(6) "43244"
    ["hra_date"]=>
    string(10) "2011-08-17"
    ["hra_maileddate"]=>
    NULL
    ["screening_id"]=>
    string(6) "3764551"
    ["screening_date"]=>
    string(10) "2011-08-12"
    ["screening_maileddate"]=>
    NULL
    ["ref"]=>
    string(1) "D"
    ["mailable"]=>
    string(3) "Yes"
  }
  [1]=>
  array(14) {
    ["user_id"]=>
    string(7) "263453"
    ["first_name"]=>
    string(6) "Dharti"
    ["last_name"]=>
    string(6) "Surani"
    ["client"]=>
    string(7) "Pro"
    ["ssn"]=>
    string(9) "345325"
    ["hiredate"]=>
    string(10) "2002-04-29"
    ["hra_id"]=>
    string(6) "3455345"
    ["hra_date"]=>
    string(10) "2010-03-22"
    ["hra_maileddate"]=>
    NULL
    ["screening_id"]=>
    string(6) "234234"
    ["screening_date"]=>
    string(10) "2011-07-11"
    ["screening_maileddate"]=>
    NULL
    ["ref"]=>
    string(1) "D"
    ["mailable"]=>
    string(3) "Yes"
  }
  [2]=>
  array(14) {
    ["user_id"]=>
    string(7) "2685056"
    ["first_name"]=>
    string(4) "Alex"
    ["last_name"]=>
    string(2) "Hu"
    ["client"]=>
    string(7) "Pro"
    ["ssn"]=>
    string(9) "000005562"
    ["hiredate"]=>
    string(10) "2011-09-15"
    ["hra_id"]=>
    string(6) "528948"
    ["hra_date"]=>
    string(10) "2011-07-06"
    ["hra_maileddate"]=>
    NULL
    ["screening_id"]=>
    string(6) "377382"
    ["screening_date"]=>
    string(10) "2011-06-15"
    ["screening_maileddate"]=>
    NULL
    ["ref"]=>
    string(1) "D"
    ["mailable"]=>
    string(3) "Yes"
  }
  [3]=>
  array(14) {
    ["user_id"]=>
    string(7) "2685056"
    ["first_name"]=>
    string(4) "Alex"
    ["last_name"]=>
    string(2) "Hu"
    ["client"]=>
    string(7) "Pro"
    ["ssn"]=>
    string(9) "000005562"
    ["hiredate"]=>
    string(10) "2011-09-15"
    ["hra_id"]=>
    string(6) "528948"
    ["hra_date"]=>
    string(10) "2011-07-06"
    ["hra_maileddate"]=>
    NULL
    ["screening_id"]=>
    string(6) "377971"
    ["screening_date"]=>
    string(10) "2011-09-13"
    ["screening_maileddate"]=>
    NULL
    ["ref"]=>
    string(1) "E"
    ["mailable"]=>
    string(3) "Yes"
  }
}

我尝试使用以下函数来删除重复，但它不能很好地工作，并且可能会在某些情况下导致错误。

 $resultDE = array_merge($resultD1, $resultE1, $resultE2);
  function specified_array_unique($array) 
  { 
      for($i=0; $i<count($array); $i++){
        if(($array[$i]['user_id'] == $array[$i+1]['user_id']) && isset($array[$i+1]))
         unset($array[$i+1]); 
      }

      return $array; 
  } 

 var_dump(super_unique($resultDE));

Answer 1

您需要决定使用哪个数组键来确定记录是否重复。在以下示例中，您将此键传递给第二个参数。

编辑我只是提高了效率......

function array_remove_duplicates ($array, $key) {
  $temp = array();
  foreach ($array as $k => $record) {
    if (isset($record[$key])) {
      // We're only going to filter records that actually have the supplied key present
      if (in_array($record[$key],$temp)) {
        // Key already exists, ignore this one
        unset($array[$k]);
      } else {
        // Key doesn't exist, add it to the tracking array
        $temp[] = $record[$key];
      }
    }
  }
  // we have filtered out the records we don't want so re-order the indexes and return the array
  return array_merge($array);
}

// ...and you could use it like this
$filteredArray = array_remove_duplicates($originalArray,'user_id');

Answer 2

尝试array_unique($myarray)（请参阅here）。

编辑：
没关系，这不适用于多维数组。但是，如果您首先将所有数组转换为字符串，然后将它们转换回数组，它就可以工作。

Answer 3

只需遍历您的数组，检查用户ID：

$userIds = array();

foreach ($users as $key => $user) {
    if (in_array($user['user_id'], $userIds)) {
        unset($users[$key]);
    } else {
        $userIds[] = $user['user_id'];
    }
}

如何删除像这样的多维数组中的重复（PHP）

3 个答案: