Question

我意识到之前已经问过这个问题，但我似乎无法工作。

我有这个多维数组

foreach ( $friendsid as $row )
{
$sql1= "SELECT friend_user_id  FROM wp_bp_friends WHERE     initiator_user_id='".$row->friend_user_id."' AND is_confirmed = 1";
$ffid = $wpdb->get_results($sql1);
// $recur_multi_dimen_arr_obj =  new RecursiveArrayIterator($ffid);
// $recur_flat_arr_obj =  new     RecursiveIteratorIterator($recur_multi_dimen_arr_obj);
// $flat_arr = iterator_to_array($recur_flat_arr_obj, false);
// print_r($flat_arr);
print_r($ffid);
}

输出以下内容

Array(
    [0] => stdClassObject([friend_user_id] => 62) [1] => stdClassObject([friend_user_id] => 51) [2] => stdClassObject([friend_user_id] => 60) [3] => stdClassObject([friend_user_id] => 65) [4] => stdClassObject([friend_user_id] => 56)
) Array(
    [0] => stdClassObject([friend_user_id] => 43) [1] => stdClassObject([friend_user_id] => 50) [2] => stdClassObject([friend_user_id] => 64) [3] => stdClassObject([friend_user_id] => 45) [4] => stdClassObject([friend_user_id] => 44)
) Array(
    [0] => stdClassObject([friend_user_id] => 57)
)

使用

$resultarray =array();
foreach($ffid as $oneitem){
    $resultarray[]=$oneitem->friend_user_id;
} 

$excluded_user =implode(", ",$resultarray);

我得到了

$excluded_user = 57;

我最终需要的是

$excluded_user = 62,51,60,....,44,57;

在使用foreach循环之前，如何在$ ffid中组合数组？

请注意，$ ffid中的数组数量可能会有所不同

提前感谢您提供任何帮助

Answer 1

您可以使用array_merge函数创建包含所有数据的数组。

这样的事情：

$arrFfid = array();
foreach ( $friendsid as $row )
{
    $sql1= "SELECT friend_user_id  FROM wp_bp_friends WHERE      initiator_user_id='".$row->friend_user_id."' AND is_confirmed = 1";
    $ffid = $wpdb->get_results($sql1);

    $arrFfid = array_merge($arrFfid, $ffid);
}

Answer 2

使用此代码：像这样的事情

$resultarray =array();
foreach ( $friendsid as $row )
{
   $sql1= "SELECT friend_user_id  FROM wp_bp_friends WHERE initiator_user_id='".$row->friend_user_id."' AND is_confirmed = 1";
   $ffid = $wpdb->get_results($sql1);
   foreach($ffid as $oneitem){
      $resultarray[] =$oneitem->friend_user_id;
   } 
}
$excluded_user =implode(", ",$resultarray);

Answer 3

函数array_map和array_walk_recursive可以解决问题。下面是一个独立的代码示例：

function flatten ( $item, $key, &$trg ) {
    array_push($trg, $item);
}
function hoist ( $item ) {
    return $item->friend_user_id;
}

$basearray = array(
                  array(
                      (Object)array("friend_user_id" => 62)
                    , (Object)array("friend_user_id" => 9)
                    , (Object)array("friend_user_id" => 42)
                  )
                , array(
                      (Object)array("friend_user_id" => 1)
                    , (Object)array("friend_user_id" => 2)
                    , (Object)array("friend_user_id" => 3)
                  )
                , array(
                      (Object)array("friend_user_id" => 99)
                    , (Object)array("friend_user_id" => 9)
                  )
             );
$resultarray = array();             
array_walk_recursive ( $basearray, 'flatten', &$resultarray );
print_r($resultarray);
$resultarray = array_map ( 'hoist', $resultarray );
print_r($resultarray);
$excluded_user = implode(", ",$resultarray);
print_r("excluded_user = " . $excluded_user . "\n");

Answer 4

array_map和array_merge似乎是这个

的不错选择

$result = array();
foreach ( $friendsid as $row ) {
    ...
    ...
    $r = array_map(function($item) {
        return $item->friend_user_id;
    }, $ffid);
    $result = array_merge($result,$r);
}

$excluded_user = implode(", ", array_unique($result));

PHP将多维数组转换为单个数组

4 个答案: