从用foreach循环构建的JSON中删除最后一个逗号
我有这个脚本构造一个JSON：
echo "{";
echo ""name": "flare","."n";
echo ""children": ["."n";
foreach($tree as $tag => $customer){
foreach($customer as $customerId => $order){
echo "{"name":"".$customerId."",";
echo ""children": ["."n";
foreach($order as $orderId => $orderTotal){
echo "{"name": "".$orderId."", "size": "".$orderTotal.""},";
}
echo "]";
echo "},";
}
}
echo "]";
echo "}";
$ Tree，$ customer和$ order是多维数组的级别，用于重复循环以查找数组的特定“$ order”级别。 生成的JSON如下JSON：
{
"name":"flare",
"children":[
{
"name":"4",
"children":[
{
"name":"17",
"size":"104.15"
},
{
"name":"18",
"size":"104.15"
},
{
"name":"23",
"size":"104.15"
},
{
"name":"25",
"size":"104.15"
}, // Remove this comma
]
},
{
"name":"12",
"children":[
{
"name":"36",
"size":"280.00"
},
{
"name":"37",
"size":"384.15"
},
{
"name":"38",
"size":"664.15"
},
{
"name":"43",
"size":"112.00"
},
{
"name":"278",
"size":"235.20"
},
{
"name":"281",
"size":"117.60"
},
{
"name":"298",
"size":"117.60"
}, // Remove this comma
]
},
{
"name":"16",
"children":[
{
"name":"60",
"size":"112.00"
}, // Remove this comma
]
},
{
"name":"17",
"children":[
{
"name":"236",
"size":"235.20"
},
{
"name":"295",
"size":"117.60"
},
]
}, // Revome this comma
]
}
一切正常，但我必须删除最后一个逗号，因为它会生成解析JSON的错误。 我不能使用substr（）和rtrim（），因为这些删除删除JSON中的所有逗号，而不是最后一个。
问候。
已更新现在我有两个级别的逗号可以删除。
正如有人已经说过，不要尝试手动构建JSON字符串，在PHP中构建数据结构并使用json_encode ：
$data = array("name" => "flare", "children" => array());
foreach($tree as $tag => $customer){
foreach($customer as $customerId => $order){
$_data = array("name" => $customerId, "children" => array());
foreach($order as $orderId => $orderTotal){
$_data["children"][] = array("name" => $orderId, "size" => $orderTotal);
}
$data["children"][] = $_data;
}
}
echo json_encode($data, JSON_PRETTY_PRINT);
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