訪問一個沒有循環的嵌套JSON密鑰

我有一個JSON字符串，如下面給出的JSON字符串存儲在$json。我想訪問第一個category_id而不使用循環。我怎樣才能訪問它？訪問一個沒有循環的嵌套JSON密鑰

$json = '{"outfits": [{"1": [{"category_id": "women_jeans", "product_id": 464540467}, {"category_id": "women_tops", "product_id": 487351815}, {"category_id": "women_coats", "product_id": 493322686}, {"category_id": "women_bags", "product_id": 483902882}, {"category_id": "women_shoes", "product_id": 492772225}]}]}'; 
$outfits = json_decode($json);

來源

2016-05-16 Rakesh Sojitra

你有多個'category_id'可利用的。哪一個你到底要訪問？ – Nikola

@Nikola：第一個有product_id：464540467 –

$ outfits = json_decode（$ json，true）; var_dump（$ outfits ['outfits'] [0] [1] [0] [「category_id」]）; –

嘗試以下代碼。

$json = '{"outfits": [{"1": [{"category_id": "women_jeans", "product_id": 464540467}, {"category_id": "women_tops", "product_id": 487351815}, {"category_id": "women_coats", "product_id": 493322686}, {"category_id": "women_bags", "product_id": 483902882}, {"category_id": "women_shoes", "product_id": 492772225}]}]}'; 
$outfits = json_decode($json,true); 
echo "Category 1: ".$outfits["outfits"][0][1][0]['category_id']; 
echo "Category 2: ".$outfits["outfits"][0][1][1]['category_id'];

輸出

women_jeans 
women_tops

您也可以使用以下功能查找特定的值。

$array = $outfits["outfits"][0][1]; 
$key = "product_id"; 
$val = "464540467"; 

function whatever($array, $key, $val) { 
    foreach ($array as $item) 
     if (isset($item[$key]) && $item[$key] == $val) 
      echo $item['category_id']; 
    return false; 
} 

whatever($array,$key,$val);

輸出

women_jeans

如果你想獲得無CATEGORY_ID環和true然後用下面。

$array = $outfits->outfits[0]->{1}; 
$category1 = $array[0]->category_id;

來源

2016-05-16 10:49:12 RJParikh

使用上面的函數獲取第一個產品ID：464540467. @Rakesh Sojitra – RJParikh

是的，我只是忘了寫json_decode（$ json，true）;真正。這是問題。 –

你可以做到這一點，沒有'true'。 [檢查我的答案]（http://stackoverflow.com/questions/37252027/how-can-i-access-category-id/37252438#37252438） –

例如，

<?php 
$json = '{"outfits": [{"1": [{"category_id": "women_jeans", "product_id": 464540467}, {"category_id": "women_tops", "product_id": 487351815}, {"category_id": "women_coats", "product_id": 493322686}, {"category_id": "women_bags", "product_id": 483902882}, {"category_id": "women_shoes", "product_id": 492772225}]}]}'; 
$outfits = json_decode($json, true); 


$arr = $outfits["outfits"][0][1];

值的直接訪問：

echo $arr[0]['category_id'].", ".$arr[1]['category_id']; 

function walk($v, $k) { 
    echo "$k : ".$v['category_id']."<br/>"; 
}

您可以使用array_walk，如果你不想讓自己的循環：

array_walk($arr, "walk"); 
?>

來源

2016-05-16 10:52:27

$json = '{"outfits": [{"1": [{"category_id": "women_jeans", "product_id": 464540467}, {"category_id": "women_tops", "product_id": 487351815}, {"category_id": "women_coats", "product_id": 493322686}, {"category_id": "women_bags", "product_id": 483902882}, {"category_id": "women_shoes", "product_id": 492772225}]}]}'; 
$outfits = json_decode($json,true);

來源

2016-05-16 10:55:30

是的，我只是發現我的錯誤在json_decode（$ json，true）;不管怎樣，謝謝。 –

$json= '{"outfits": [{"1": [{"category_id": "women_jeans", "product_id": 464540467}, {"category_id": "women_tops", "product_id": 487351815}, {"category_id": "women_coats", "product_id": 493322686}, {"category_id": "women_bags", "product_id": 483902882}, {"category_id": "women_shoes", "product_id": 492772225}]}]}'; 

//convert json to associative array. 
$json_array = json_decode($json,true); 

// Return the values from a single column in the input array 
$newArray= array_column($json_array["outfits"][0][1],"category_id");

輸出

Array 
(
    [0] => women_jeans 
    [1] => women_tops 
    [2] => women_coats 
    [3] => women_bags 
    [4] => women_shoes 
)

注意：我想沒有循環來訪問它array_column只能從5.5+

來源

2016-05-16 11:05:15 user6123296

OP的要求。這不是正確的原因你有多個category_id，所以問題是哪一個你需要。所以你需要循環。

通過使用json_decode您將有一個對象數組，因此您需要執行這些操作。讓$json是你的字符串。通過在foreach循環中使用$outfits->outfits[0]->{1}只需獲取結果數組的最後一個維度，便於訪問category_id。

$outfits = json_decode($json); 

foreach($outfits->outfits[0]->{1} as $val){ 
    echo $val->category_id."<br/>"; 
}

結果：

women_jeans 
women_tops 
women_coats 
women_bags 
women_shoes

來源

2016-05-16 11:06:25

訪問一個沒有循環的嵌套JSON密鑰

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