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PHP利用数组构造JSON

2017-01-16 14:02 375 查看

问题起因

以往都是直接用构造数组的形式构造json

例子：

$arr = array("A"=>"1","B"=>"2");
$arr = json_encode($arr);
print_r($arr);

得到输出：

{"A":"1","B":"2","C":"3"}

然而此时要构造这样的json：

{
"table": [
{
"id": "0",
"flow": [
{
"id": "0",
"match": {
"in-port": "1",
"vlan-match": {
"vlan-id": {
"vlan-id-present": "true",
"vlan-id": "20"
}
}
},
"instructions": {
"instruction": [
{
"apply-actions": {
"action": [
{
"output-action": {
"output-node-connector": "3",
"max-length": "65535"
},
"order": "1"
},
{
"pop-vlan-action": {},
"order": "0"
}
]
},
"order": "0"
}
]
},
"buffer_id": "65535",
"installHw": "true",
"barrier": "true",
"strict": "true",
"priority": "160",
"idle-timeout": "0",
"hard-timeout": "0",
"table_id": "0"
}
]
}
]
}

对于[] ,以及空的{}的如果构造是一个难题。

问题解决

访问到了一篇文章 php构造json的方法，并补充了构造空{}的方案

构造空{}方案如下：

$arr = array("A"=>"1","B"=>"2","C"=>"3","D"=> new stdClass());
$arr = json_encode($arr);
print_r($arr);

结果

{"A":"1","B":"2","C":"3","D":{}}

综合上述方案，构造上述方案，并得到解决

$post_data = array();
$post_data["table"][0]['id'] = "0";
$post_data["table"][0]['flow'][0]["id"] = "0";
$post_data['table'][0]['flow'][0]["match"]["in-port"] = "1";
$post_data['table'][0]['flow'][0]['match']['vlan-match']['vlan-id']['vlan-id-present'] = "true";
$post_data['table'][0]['flow'][0]['match']['vlan-match']['vlan-id']['vlan-id'] = "20";
$post_data['table'][0]['flow'][0]['instructions']['instruction'][0]['apply-actions']['action'][0]['output-action']['output-node-connector'] = "3";
$post_data['table'][0]['flow'][0]['instructions']['instruction'][0]['apply-actions']['action'][0]['output-action']['max-length'] = "65535";
$post_data['table'][0]['flow'][0]['instructions']['instruction'][0]['apply-actions']['action'][0]['order'] = "1";
$post_data['table'][0]['flow'][0]['instructions']['instruction'][0]['apply-actions']['action'][1]['pop-vlan-action'] = new stdClass();
$post_data['table'][0]['flow'][0]['instructions']['instruction'][0]['apply-actions']['action'][1]['order'] = "0";
$post_data['table'][0]['flow'][0]['instructions']['instruction'][0]['order'] = "0";
$post_data['table'][0]['flow'][0]['buffer_id'] = "65535";
$post_data['table'][0]['flow'][0]['installHw'] = "true";
$post_data['table'][0]['flow'][0]['barrier'] = "true";
$post_data['table'][0]['flow'][0]['strict'] = "true";
$post_data['table'][0]['flow'][0]['priority'] = "160";
$post_data['table'][0]['flow'][0]['idle-timeout'] = "0";
$post_data['table'][0]['flow'][0]['hard-timeout'] = "0";
$post_data['table'][0]['flow'][0]['table_id'] = "0";

$post_data = json_encode($post_data);
echo $post_data;
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