我怎麼能從json_decode中獲取ids php

Question

我想通過使用json_decode函數來獲取json的所有ids，這個response.How可以只在數組中獲得id嗎？我非常感謝任何幫助。

響應：

{ 
    "columns": [ 
    "name", 
    "id", 
    "sno" 
    ], 
    "data": [ 
    [ 
     "test1", 
     "123", 
     "1" 
    ], 
    [ 
     "test2", 
     "456", 
     "2" 
    ] 
    ] 
} 

代碼：

$obj = json_decode($result, true); 
foreach ($obj as $key => $value) { 
    foreach ($value as $k => $val) { 
     echo $val; 
     if ($k == "id") { 
      array_push($all_ids, $val); 
     } 
    } 
} 

Answer 1

$obj  = json_decode($result); 
$all_ids = array(); 

foreach ($obj->data as $el) { 
    array_push($all_ids, $el[1]); 
} 

Answer 2

array_map()

$ids = array_map(function($a){return $a[1];}, $obj['data']); 

Answer 3

你可以做到這一點，如下所示，使用in_array和array_map：

$obj = json_decode($result); 
// identify which column number corresponds to "id" 
$idColumnNo = in_array('id', $obj->columns); 
// collect the elements at that column number from the data array 
$all_ids = array_map(function ($elem) { 
    return $elem[$idColumnNo]; 
}, $obj->data);