PHP json_decode（）无法正常工作

Question

I have a problem I am getting a json file I can echo it and it looks like this

[{"sys_data":"0MxPPaza","date":"2015-02-15","objective":"VIDEO"}]

in my code I am doing this

$json = FROM THE SERVER;
$obj = json_decode($json);
$res = $obj->["objective"];
echo $res;

res is NULL obj is NULL also

Answer 1

Your json_decode call returns an array, with one member.

Here is a dump of your json object:

array (size=1) 0 => object(stdClass)[10] public 'sys_data' => string '0MxPPaza' (length=8) public 'date' => string '2015-02-15' (length=10) public 'objective' => string 'VIDEO' (length=5)

so replace this line:

$res = $obj->["objective"];

With this:

$res = $obj[0]->objective;

Answer 2

Just replace [] quotes to {} . Like $res = $obj[0]->{"objective"};

Or you may use assoc array convertation instead of object:

$json = FROM THE SERVER;
$obj = json_decode($json, true);
$res = $obj["objective"];
echo $res;`