Write JSON into a file with PHP - php

Question

I have this JSON-File here
{
"id" : "bf75b277-169b-49da-8ab1-b78b8dfg1b43-e25c7f28b3",
"ts" : "1372751172664",
"connected" : {
"ssid" : "eduroam",
"bssid" : "00:0f:f9:eb:08:81",
"rssi" : "-62",
"speed" : "53"
},
"configured" : [
{
"ssid" : "eduroam",
"bssid" : "null",
"keyMgmnt" : ["2", "3"],
"grCiphers" : ["0","1","2","3"]
},
{
"ssid" : "foobar",
"bssid" : "null",
"keyMgmnt" : ["0"],
"grCiphers" : ["0","1","2","3"]
}
],
"location" : {
"prov" : "network",
"lat" : "52.3793203",
"lon" : "9.7231332",
"acc" : "22.777"
}
}
and I'm trying to get the key-value-pairs out into a file (and later into a mysql-database).
I am having trouble to go along the nested structure. Maybe I do not understand it correctly?
$LOGPATH = "/var/www/test/";
$out = fopen($LOGPATH."testlog.log", "a");
$result = file_get_contents('php://input');
$data = json_decode($result, true);
$value = $data;
$test = array();
This line beneath causes me headaches, how can I say get the key-value-pairs of "connected"?
Trying $test = $data['connected'] did not work, as the output simply is a "{" and nothing more...
$test = $data;
fwrite($out, "test \n");
fwrite($out, $test);
fwrite($out, "\n");
foreach ($test as $entry){
fwrite($out, $entry);
fwrite($out, "\n");
}
Any idea how to extract the key-value-pairs and/or help me understand the structure?

Answer 1

This should get you on the right track
foreach($data['connected'] as $key => $value){
echo 'Key: '.$key.' Value:'.$value.'<br>';
}

Answer 2

json_decode() will dump JSON into regular array. You can do print_r() or var_dump() on it, to see the structure of the array. So to get your connected leaf you do:
$connected = $data['connected'];
You can then iterate over it:
foreach( $connected as $key=>$val ) {
echo $key . ": " . $val;
}

Answer 3

Got it, thanks to you guys!
// Get a request from i.e. a webpage (this is a webservice)
$jsonArray = file_get_contents('php://input');
// put the JSON-Data into an array
$jsonData = json_decode($jsonArray, true);
// You can simply choose the entry-points. As they do not change for me, they are hardcoded in here, else you had to use something like a for-loop to extract them
$jsonConnect = $jsonData['connected'];
$jsonLocation = $jsonData['location'];
$jsonConfigured = $jsonData['configured'];
// walk through the JSON-Data and extract the values, although the array has more than 2 levels, you can select your entry-point and walk from there on, which makes this quite easy
for($i = 0; $i < count($jsonConfigured); $i++){
// keyMgmnt itself is an array and I want to concatenate all of its values and put it into a single field in my MySQL-DB, so implode() is used
$keyMgmnt = implode(",", $jsonConfigured[$i]['keyMgmnt']);
$grCiphers = implode(",", $jsonConfigured[$i]['grCiphers']);
$ssid = $jsonConfigured[$i]['ssid'];
$bssid = $jsonConfigured[$i]['bssid'];
// from here on I simply put the variables into my MySQL-DB
$sql_configured = "INSERT INTO configured (keyMgmnt, grCiphers, ssid, bssid) VALUES ('$keyMgmnt', '$grCiphers', '$ssid', '$bssid')";
mysql_query($sql_configured) or die ("Failure in configured");
}
$sql_connected = "INSERT INTO connected (rssi, speed, ssid, bssid) VALUES ('$jsonConnect[rssi]', '$jsonConnect[speed]', '$jsonConnect[ssid]', '$jsonConnect[bssid]')";
$enterConnected = mysql_query($sql_connected) or die("Failure in connection!");
$sql_location = "INSERT INTO location (lat, prov, lon, acc) VALUES ('$jsonLocation[lat]', '$jsonLocation[prov]', '$jsonLocation[lon]', '$jsonLocation[acc]')";
$enterLocation = mysql_query($sql_location) or die("Failure in location!");
Thanks again!
Case closed.
PS: The structure of the JSON-Data. You get it by using "print_r()" or "var_dump()".
(
[id] => bf75b277-169b-49da-8ab1-b78b80f51b43-e25c7f28b3
[ts] => 1372751172664
[connected] => Array
(
[ssid] => eduroam
[bssid] => 00:0f:f7:eb:08:81
[rssi] => -62
[speed] => 54
)
[configured] => Array
(
[0] => Array
(
[ssid] => eduroam
[bssid] => null
[keyMgmnt] => Array
(
[0] => 2
[1] => 3
)
[grCiphers] => Array
(
[0] => 0
[1] => 1
[2] => 2
[3] => 3
)
)
[1] => Array
(
[ssid] => foobar
[bssid] => null
[keyMgmnt] => Array
(
[0] => 0
)
[grCiphers] => Array
(
[0] => 0
[1] => 1
[2] => 2
[3] => 3
)
)
)
[location] => Array
(
[prov] => network
[lat] => 52.3793203
[lon] => 9.7231332
[acc] => 22.777
)
)
(
[id] => bf75b277-169b-49da-8ab1-b78b80f51b43-e25c7f28b3
[ts] => 1372751172664
[connected] => Array
(
[ssid] => eduroam
[bssid] => 00:0f:f7:eb:08:81
[rssi] => -62
[speed] => 54
)
[configured] => Array
(
[0] => Array
(
[ssid] => eduroam
[bssid] => null
[keyMgmnt] => Array
(
[0] => 2
[1] => 3
)
[grCiphers] => Array
(
[0] => 0
[1] => 1
[2] => 2
[3] => 3
)
)
[1] => Array
(
[ssid] => foobar
[bssid] => null
[keyMgmnt] => Array
(
[0] => 0
)
[grCiphers] => Array
(
[0] => 0
[1] => 1
[2] => 2
[3] => 3
)
)
)
[location] => Array
(
[prov] => network
[lat] => 52.3793203
[lon] => 9.7231332
[acc] => 22.777
)
)