如何在二维数组的某些字段上内爆 - How can I do an implode on certain fields of a two-dimensional array?

How can I do an implode on certain fields of a two-dimensional array?

本文关键字：字段二维数组 | 更新日期: 2023-09-27

我有一个二维数组，格式如下所示。我如何使用implode()仅输出user_id，以便最终结果1705,1757,1832？

 Array ( 
    [0] => 
    Array ( 
        [nickname] => picachu 
        [user_id] => 1705 
        [name] => picachu .jpg 
        [city_name] => pallet town
    ) 
    [1] =>
     Array (
       [nickname] => charmander 
       [user_id] => 1757  
       [name] => charmander.jpg 
       [city_name] => verivian city 
    ) 
    [2] =>
    Array ( 
       [nickname] => squaretle 
       [user_id] => 1832 
       [name] => squaretle.jpg 
       [city_name] => Celadon 
    ) 
)

PHP 5.5：

$result = join(',', array_column($data, 'user_id'));

5.3<=PHP<=5.4：

$result = join(',', array_map(function($item)
{
   return $item['user_id'];
}, $data));

PHP<5.3：

$result = join(',', array_map(create_function('$item', 'return $item["user_id"];')));

$nested_array = array();
foreach($array as $a) {
    $nested_array[] = $a['user_id'];
}
$implode = implode(',',$nested_array);

或

$implode = '';
foreach($array as $a) {
    $implode .= $a['user_id'] . ',';
}
$implode = substr($implode,-1);

你可以试试这个：

foreach ($array as $row)
{
  $values[] = $row['user_id'];
}
$user_id= implode(',', $values);
echo $user_id;
?>

您也可以尝试：

implode(', ', array_map(function($k){ return $k['user_id'];}, $arr));