替代方法在PHP

Question

顯示特定JSON數據我從JSON文件中使用的URL這樣的提取數據：

$html5=file_get_contents("url"); 

$data = json_decode($html5);  

echo $data->a->k->f; 

這將顯示$27.58這是正確的。

這裏是我的JSON數據：

{ 
"a":{ 
    "k":{ 
    "c":"tr", 
    "f":"$27.58", 
    "fb":"$30.35", 
    "ci":"12873809", 
    "cname":"Cdkeysgame_com", 
    "ep":"26.05", 
    "epb":"28.66", 
    "a":"5473091", 
    "it":"steam", 
    "sl":"0", 
    "l":null, 
    "lt":null, 
    "x":0, 
    "v":"retail", 
    "ne":0, 
    "so":0, 
    "tr":304, 
    "r":97, 
    "cf":1, 
    "p":"27.58317275", 
    "pb":"30.3467843", 
    "eci":"865723abbf1cbb952ad4d2da8a8c925e" 
    }, 
    "k_1":{ 
    "c":"gb", 
    "f":"$27.64", 
    "fb":"$30.40", 
    "ci":"1065801", 
    "cname":"World_of_games", 
    "ep":"26.10", 
    "epb":"28.71", 
    "a":"781851", 
    "it":"steam", 
    "sl":"0", 
    "l":null, 
    "lt":null, 
    "x":0, 
    "v":"all", 
    "ne":0, 
    "so":0, 
    "tr":1041328, 
    "r":99, 
    "cf":1, 
    "p":"27.6361155", 
    "pb":"30.39972705", 
    "eci":"d01a7cacb0e424123985bfe2e53a0523" 
    }, 
    "k_2":{ 
    "c":"ch", 
    "f":"$27.68", 
    "fb":"$30.44", 
    "ci":"696012", 
    "cname":"G_hard", 
    "ep":"26.14", 
    "epb":"28.75", 
    "a":"1287052", 
    "it":"steam", 
    "sl":"0", 
    "l":null, 
    "lt":null, 
    "x":0, 
    "v":"retail", 
    "ne":0, 
    "so":0, 
    "tr":10818, 
    "r":99, 
    "cf":1, 
    "p":"27.6784697", 
    "pb":"30.44208125", 
    "eci":"a6666c0a47acb70d14b757cd52f1b9cc" 
    }} 

我需要不使用k顯示相同的數據。例如我想：

echo $data->a->'Something that specifies first element of 'a' i.e k and not'k_1' and 'k_2'->f; 

由於我刮這個內容我不能改變任何結構或數據在這個JSON文件。

Answer 1

如果你只是想a下的第一個入口，那麼，可以解碼作爲數組：

$data = json_decode($json, true); 

然後得到的$data['a']的第一個元素，並使用它。 current()還將努力：

echo reset($data['a'])['f']; 

或重新索引$data['a']數字和訪問的第一個0：

echo array_values($data['a'])[0]['f']; 

，趕上他們：

foreach($data['a'] as $values) { 
    echo $values['f']; 
    //break; if you only want the first one 
} 

Answer 2

你可以這樣做，所以：

$object = json_decode($html5); 

foreach ($object->a as $element) { 
    echo $element->f; 
}