>我正在尝试使用以下代码从网站获取数据：
<?php
$url = 'http://services.runescape.com/m=itemdb_oldschool/api/catalogue/detail.json?item=4798';
$content = file_get_contents($url);
var_dump($content);
$json = json_decode($content, true);
var_dump($json);
for ($idx = 0; $idx < count($json); $idx++) {
$obj = (Array)$json[$idx];
echo 'result' . $obj["name"];
}
?>
这让我得到了这个结果：
字符串（0） " 空
<?php
$url = 'http://services.runescape.com/m=itemdb_oldschool/api/catalogue/detail.json?item=4798';
$content = file_get_contents($url);
echo "<pre>";
//print_r($content);
$data = json_decode($content);
print_r($data); //Show the json decoded data comes form $url
##Parse this array {$data} using foreach loop as your use
?>
从您在问题中发布的 URL 返回的 json 中没有数字键。因此，使用数字键循环访问关联数组不会返回任何内容。
这是您正在使用的 json 的结构：
{
"item": {
"icon": "http://services.runescape.com/m=itemdb_oldschool/5122_obj_sprite.gif?id=4798",
"icon_large": "http://services.runescape.com/m=itemdb_oldschool/5122_obj_big.gif?id=4798",
"id": 4798,
"type": "Default",
"typeIcon": "http://www.runescape.com/img/categories/Default",
"name": "Adamant brutal",
"description": "Blunt adamantite arrow... ouch.",
"current": {
"trend": "neutral",
"price": 529
},
"today": {
"trend": "neutral",
"price": 0
},
"members": "true",
"day30": {
"trend": "negative",
"change": "-9.0%"
},
"day90": {
"trend": "negative",
"change": "-20.0%"
},
"day180": {
"trend": "negative",
"change": "-31.0%"
}
}
}
尝试访问$json["item"] 。这应该会给你一些更有意义的工作。如果要循环访问项目中的键/值对，请使用foreach循环：
foreach($json["item"] as $key => $value) {
echo $key . ":";
print_r($value);
}