php post json to remote server and get json result - php

Question

i would like to post json data to remote url, and the url will return json format data. here is my code:
$post_array=Array(
"trips"=>array(
"departure_code"=> "SIN",
"arrival_code"=> "HKT",
"outbound_date"=>"2014-02-29",
"inbound_date"=> "2014-03-05"
),
"adults_count"=> 1
);
$content = json_encode($post_array);
$curl = curl_init($search_url);
curl_setopt($curl, CURLOPT_HEADER, false);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_HTTPHEADER, array("Content-type: application/json"));
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_POSTFIELDS, $content);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
$result = curl_exec($curl);
//$response = json_decode($result);
var_dump($result);
curl_close($curl);
The results should be:
{
"id": "pNQFapkhRQ6ZYxql4MQDbQ",
"key": "[SIN:HKT:2014-01-29:2014-02-05]~1~0~XX~FI",
"trips": [
{
"id": "SIN:HKT:2014-01-29:2014-02-05",
"departure_code": "SIN",
"departure_name": "Singapore",
"trip_type": "standard"
}
],
"cabin": "economy",
"adults_count": 1,
}
I got string(35) "{"message":"Problems parsing JSON"}" error. Thanks for help.

Answer 1

what is the $search_url ?
Do you have any documentation for this service ?
Try to change this line:
curl_setopt($curl, CURLOPT_HTTPHEADER, array("Content-type: application/json"));
to:
curl_setopt(
$curl,
CURLOPT_HTTPHEADER,
array(
"Content-type: application/json",
"Content-Length: ".strlen($content)
)
);

Answer 2

Here I'm showing you a simple demo of the cURL
$curl = curl_init($url);
curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_HEADER, 0);
curl_setopt($curl, CURLOPT_POSTFIELDS, $data_string);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl, CURLOPT_HTTPHEADER, array(
'Content-Type:application/json',
'Content-Length:'.strlen($data_string)
));
$json_response = curl_exec($curl);
$curl_errorno = curl_errno($curl);
$status = curl_getinfo($curl, CURLINFO_HTTP_CODE);