array_push（）期望参数1是阵列与array_push使用键

Question

我想循环一个JSON对象，并使用键将选定的值推入数组。

$json = ' { "from": 1, "to": 2, "total": 2, "currentPage": 1, "totalPages": 1, "queryTime": "0.004", "totalTime": "0.020", "partial": false, "canonicalUrl": "/v1/products(offers.type=deal_of_the_day)?format=json&apiKey=946n9vuhdkgeyz2qx2dpxd54","products": [ { "sku": 5998225, "productId": 1219180376135, "name": "LG - 1.1 Cu. Ft. Mid-Size Microwave - Black", "source": "bestbuy", "type": "HardGood", "startDate": "2014-07-06","new": false, "active": true, "lowPriceGuarantee": true, "activeUpdateDate": "2014-11-03T19:43:46", "regularPrice": 124.99, "salePrice": 99.99, "onSale": true},{ "sku": 2634897, "productId": 1218343205770, "name": "Rocketfish In-Wall HDMI Cable", "source": "bestbuy", "type": "HardGood", "startDate": "2011-08-14", "new": false, "active": true,"lowPriceGuarantee": false, "activeUpdateDate": "2014-11-03T18:03:02", "regularPrice": 29.99, "salePrice": 24.99, "onSale": true } ] }'; 

$json_output = json_decode($json); 
$pBB = array(); 
foreach($json_output->products as $obj){ 
    array_push($pBB['title']," {$obj->name}"); 
    array_push($pBB['type']," {$obj->type}"); 
    //array_push($pBB," {$obj->name}"); without key works fine 
} 
echo json_encode($pBB); 

以下是我收到

<br /> 
<b>Warning</b>: array_push() expects parameter 1 to be array, null given on line <b>6</b><br /> 
<br /> 
<b>Warning</b>: array_push() expects parameter 1 to be array, null given on line <b>6</b><br /> 
{"title":null} 

如果我推的值，而它的工作原理按键错误，我得到下面的输出

[" LG - 1.1 Cu. Ft. Mid-Size Microwave - Black"," Rocketfish In-Wall HDMI Cable"] 

任何想法，在此先感谢！

Answer 1

$pBB['title']是null因为您还没有定义它。

变化

$pBB = array(); 

到

$pBB = array("title" => array(), "type" => array()); 

---

更新：

$pBB = array(); 
foreach($json_output->products as $obj){ 
    $pBB[] = array(
     "title" => $obj->name, 
     "type" => $obj->type 
    ); 
} 
echo json_encode($pBB);