PHP数组大括号而不是方括号

Question

I'm attempting to output curly brackets from my array like this:

"data":{facebook":{"message"}},

but I keep getting square brackets:

"data":{"facebook":["message"]}

Here is my code:

$output["contextOut"] = array(array("name" => "$next-context", "parameters" =>
array("param1" => $param1value, "param2" => $param2value)));
$output["speech"] = $outputtext;
$output["data"] = array("facebook" => array("message"));
$output["displayText"] = $outputtext;
$output["source"] = "index.php";
ob_end_clean();
echo json_encode($output);

and this is my json encoded output:

{"contextOut":[{"name":"buy-context","parameters":{"param1":null,"param2":null}}],"speech":"msg","data":{"facebook":["message"]},"displayText":"msg","source":"index.php"}

How do I obtain the curly brackets instead of the square brackets? Thanks in advance for any help.

Answer 1

As Paul Crovella said, your stated goal is invalid JSON.

Your valid options are for the facebook property to directly contain the message string:

{
    "data":{"facebook":"message"},
}

(note I've added the outer { and } missing from your question) ...in which case you want:

$output["data"] = array("facebook" => "message");

Or you can make facebook refer to an object with a message property that has a value, like this:

{
    "data":{"facebook":{"message":"value"}},
}

by doing this:

$output["data"] = array("facebook" => array("message" => "value"));