json和PHP解析
为什么我不能用PHP从json文件中获取值? 我得到零值?我已经试了好几个小时了json和PHP解析,php,json,parsing,Php,Json,Parsing,为什么我不能用PHP从json文件中获取值? 我得到零值?我已经试了好几个小时了 <?php $json_string = 'http://pubapi.cryptsy.com/api.php?method=singlemarketdata&marketid=44'; $jsondata = file_get_contents($json_string); $data = json_decode($jsondata, TRUE); print_r($data);
<?php
$json_string = 'http://pubapi.cryptsy.com/api.php?method=singlemarketdata&marketid=44';
$jsondata = file_get_contents($json_string);
$data = json_decode($jsondata, TRUE);
print_r($data);
echo "<br><br><br><br>";
foreach ($data as $recenttrades) {
echo "VALUES('{$recenttrades->quantity}', '{$recenttrades->price}' ";
}
?>
recenttrades
在该数组中嵌套得相当深。试一试
foreach ($data['return']['markets']['FST']['recenttrades'] as $recenttrades) {
recenttrades
是多层次嵌套的,因此仅对每个($recenttrades)执行foreach($recenttrades)是不够的
您需要执行以下操作:
$recentTrades = $data['return']['markets']['FST']['recenttrades'];
foreach($recentTrades as $recentTrade) {
...
}
recenttrades
嵌套得很深,您需要的是数组,而不是对象。这似乎有效:
foreach ($data['return']['markets']['FST']['recenttrades'] as $recenttrades) {
echo "VALUES('{$recenttrades['quantity']}', '{$recenttrades['price']}' ";
}
其他人提到,您处理的是嵌套数组,而不是对象。除了指出嵌套相当深的问题外,我还建议使用foreach
(我可能会因此而被钉死):
为了响应您的更新,如果您想在市场上循环,请尝试以下操作:
foreach($data['return']['markets']作为$market){
echo“主代码:{$market['primarycode']}
”;
foreach($market[“recenttrade”]作为$recenttrade){
回显“数量:.$recenttrade['quantity']。”,价格:“$recenttrade['price']。”
”;
}
}
我可能错了,但如果第二个参数=true,则会得到一个关联数组。但是在这里,你试图从一个对象中访问值,如果你想返回一个对象,这可能有助于删除TRUE。但是我怎样才能在循环中找到其他人呢?我已经尝试过这样做:你可以复制我在$recenttrade
上执行的echo
/print\r
块,并将其应用于foreach
序列的每个级别。这将显示给定级别上可用的每个$key=>$val
对。这有意义吗?
foreach ($data['return']['markets']['FST']['recenttrades'] as $recenttrades) {
echo "VALUES('{$recenttrades['quantity']}', '{$recenttrades['price']}' ";
}
<?php
$json_string = 'http://pubapi.cryptsy.com/api.php?method=singlemarketdata&marketid=44';
$jsondata = file_get_contents($json_string);
$data = json_decode($jsondata, TRUE);
//print_r($data);
echo "<br><br><br><br>";
foreach ($data as $markets) {
foreach($markets as $market) {
foreach($market as $attributes) {
foreach($attributes["recenttrades"] as $recenttrade) {
//echo "<pre>";
//print_r($recenttrade);
//echo "</pre>";
echo "VALUES('{quantity: " . $recenttrade['quantity'] ."}', 'price: {" . $recenttrade['price'] . "}')";
}
}
}
}
foreach ($data['return']['markets'] as $market) {
echo "Primary code: <strong>{$market['primarycode']}</strong><br>";
foreach ($market["recenttrades"] as $recenttrade) {
echo "quantity: " . $recenttrade['quantity'] .", price: " . $recenttrade['price'] . "<br>";
}
}