JSON full circle (PHP) - php

Question

I've reduced to the simplest form, and am still stumbling...I've spent more than 30 hours researching and testing. According to all of the posts which never show more than 15° of the entire circle, this is supposed to be really easy.
I want to:
Send query parameters (in JSON) from an Android Phone to a WAMP server...This may be as much as a complete dump of a local SQLite table, so query strings just won't cut it.
Have the WAMP server read the JSON data, formulate a SQL query and submit to the mySQL database
Package a response as JSON data (from a simple "OK" to a full table dump)
Return the response package to the Android phone
This is already a fully functional WAMP application, and I want to integrate Android access. For this reason, I really want to avoid AJAX, since I want to maintain consistency with what's already in place.
I've reduced this to the simplest loop and am hitting snags. I'm using send.php to post some JSON data to receive.php. At this point, I just need receive.php to read the data and send it back (slightly modified) to send.php
send.php is properly reading stock JSON sent from receive.php. I just can't get any sign of life that receive.php even recognizes the JSON sent to it.
PLEASE don't direct me towards cURL...from everything I've found regarding Android and JSON, cURL is a tangent which will send me full circle back into nonfunctionality.
APACHE 2.2.22, PHP 5.4.3
Like I said, I've reduced this to the simplest form to demonstrate a full circle...
send.php:
<?php
$url = "http://192.168.0.102:808/networks/json/receive.php";
$data = array(
'param1' => '12345',
'param2' => 'fghij'
);
$json_data = json_encode($data);
$options = array(
'http' => array(
'method' => 'POST',
'content' => $json_data,
'header'=> "Content-Type: application/json\r\n" .
"Accept: application/json\r\n" .
'Content-Length: ' . strlen($json_data) . "\r\n"
)
);
$context = stream_context_create( $options );
$result = file_get_contents( $url, false, $context );
$response = json_decode( $result , true);
echo '[' . $response['param1'] . "]\n<br>";
//THIS WORKS! send.php displays "Initialized"
?>
receive.php
<?php
$newparam = 'Initialized';
//HERE I NEED TO read the JSON data and do something
$data = array(
'param1' => $newparam,
'param2' => 'pqrst'
);
header('Content-type: application/json');
echo json_encode($data);
?>

Answer 1

It is actually easy, as stated in all the incomplete explanations...I got the full circle to work finally
I've chosen simplicity to prove I could travel full circle, and I have now done so.
send.php
<?php
//The URL of the page that will:
// 1. Receive the incoming data
// 2. Decode the data and do something with it
// 3. Package the results into JSON
// 4. Return the JSON to the originator
$url = "http://192.168.0.102:808/networks/json/receive.php";
//The JSON data to send to the page (above)
$data = array(
'param1' => 'abcde',
'param2' => 'fghij'
);
$json_data = json_encode($data);
//Prep the request to send to the web site
$options = array(
'http' => array(
'method' => 'POST',
'content' => $json_data,
'header'=> "Content-Type: application/json\r\n" .
"Accept: application/json\r\n"
)
);
$context = stream_context_create( $options );
//Make the request and grab the results
$result = file_get_contents( $url, false, $context );
//Decode the results
$response = json_decode( $result , true);
//Do something with the results
echo '[' . $response['param1'] . "]\n<br>";
?>
receive.php
<?php
//K.I.S.S. - Retrieve the incoming JSON data, decode it and send one value
//back to send.php
//Grab the incoming JSON data (want error correction)
//THIS IS THE PART I WAS MISSING
$data_from_send_php = file_get_contents('php://input');
//Decode the JSON data
$json_data = json_decode($data_from_send_php, true);
//CAN DO: read querystrings (can be used for user auth, specifying the
//requestor's intents, etc)
//Retrieve a nugget from the JSON so it can be sent back to send.php
$newparam = $json_data["param2"];
//Prep the JSON to send back
$data = array(
'param1' => $newparam,
'param2' => 'pqrst'
);
//Tell send.php what kind of data it is receiving
header('Content-type: application/json');
//Give send.php the JSON data
echo json_encode($data);
?>
AND Android integration...called with a Button.onClickListener
public void getServerData() throws JSONException, ClientProtocolException, IOException {
//Not critical, but part of my need...Preferences store the pieces to manage JSON
//connections
Context context = getApplicationContext();
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
String netURL = prefs.getString("NetworkURL", "");
// "http://192.168.0.102:808/networks/json"
String dataPage = prefs.getString("DataPage", "");
// "/receive.php"
//NEEDED - the URL to send to/receive from...
String theURL = new String(netURL + dataPage);
//Create JSON data to send to the server
JSONObject json = new JSONObject();
json.put("param1",Settings.System.getString(getContentResolver(),Settings.System.ANDROID_ID));
json.put("param2","Android Data");
//Prepare to commnucate with the server
DefaultHttpClient httpClient = new DefaultHttpClient();
ResponseHandler <String> resonseHandler = new BasicResponseHandler();
HttpPost postMethod = new HttpPost(theURL);
//Attach the JSON Data
postMethod.setEntity(new ByteArrayEntity(json.toString().getBytes("UTF8")));
//Send and Receive
String response = httpClient.execute(postMethod,resonseHandler);
//Begin reading and working with the returned data
JSONObject obj = new JSONObject(response);
TextView tv_param1 = (TextView) findViewById(R.id.tv_json_1);
tv_param1.setText(obj.getString("param1"));
TextView tv_param2 = (TextView) findViewById(R.id.tv_json_2);
tv_param2.setText(obj.getString("param2"));
}