json解码和编码 - 迭代通过多维数组并删除键值，如果等于某个值

Question

Basically the json output is this -output is from php.

[{"attr":{"id":"node_2","rel":"default"},"data":"C:","state":"closed"},{"attr":{"id":"node_3","rel":"drive"},"data":"D:","state":"closed"}]

so because rel is equal to default

{"attr":{"id":"node_2","rel":"default"},"data":"C:","state":"closed"}

I need to remove this from the array.

I have thought of maybe using

foreach($arr as $key => &$item) {
    if ($value['rel'] == 'default'{
        unset($arr[$key]);

This however, wont work for some reason. I have no idea if my method is the best way, or whether there is a better way to achieve this. I also need to decode and encode it.

Answer 1

You can use json_encode and json_decode to parse the json as Jesse Bunch said.

After i decoded the json you posted, it returned as an object. To call on an object you have to do things a bit diffrent.

$arr = json_decode('[{"attr":{"id":"node_2","rel":"default"},"data":"C:","state":"closed"},{"attr":{"id":"node_3","rel":"drive"},"data":"D:","state":"closed"}]');

foreach($arr as $key => $row)
{
    if ($row->attr->rel == 'default'){
        unset($arr[$key]);
    }
}

var_dump($arr);

The $arr does no longer contain the default rel