How to end an array of json data, and echo another value? - php

Question

I'm using php to return an array of data, with the command json_encode(). I want to also send some other data after I send this array. I'm using the jquery library. My php code is as follows:
<?php
//// Query
$sql = "SELECT gtn FROM $table WHERE gid < 10";
//// Open connection
$con = pg_connect("host=12.12.2.2 port=5434 dbname=spatial_data user=postgres password=****");
if (!$con){echo 'error connecting'; die; }
//// Run query
$query = pg_query($con, $sql);
$arrayData = array(); // Store results from query in arrays
//// Parse results
while($r = pg_fetch_row($query)) {
$arrayData[] = $r[0];
}
echo json_encode($arrayData);
//// Return metadata about calculation
//echo "$('#messages').html('Result returned for New York')";
//// close connection
pg_close($con);
?>
This php is responding to a jquery post command:
$.ajax({
type: "POST",
url: "/php/array_test_v3.php",
data:{vertices: pointlist},
success: function(arrayData){
//console.log(arrayData[0])
for(i=0;i<arrayData.length; i++){
setGeoJson(arrayData[i]);
}
},
dataType:'json'
});
This is a spatial database, and when I query the information, I also want to return some other values. For example, if the area is New York, I want to return an array of data and also the string New York. At the moment the line echo "$('#messages').html('Result returned for New York')"; just appends to the array of information. Is there a way that I can escape from the array, or do I need to have a separate post function to get this information.

Answer 1

Instead of echo json_encode($arrayData);, just fetch the meta data and then do:
echo json_encode(array(
'data' => $arrayData,
'meta' => $metaData
));
And then in JQuery:
success: function(result){
for(i=0;i<result.data.length; i++){
setGeoJson(result.data[i]);
}
// do something with result.meta
},

Answer 2

assuming you are using php.
make the array like this below
while($r = pg_fetch_row($query)) {
$arrayData[] = array('gtn'=>$r[0],'someotherkey'=>'someothervalue','anotherkey'=>'anothevalue');
}
echo json_encode($arrayData);
now in jquery you can do this
$.ajax({
type: "POST",
url: "/php/array_test_v3.php",
data:{vertices: pointlist},
success: function(arrayData){
$.each(arrayData,function(index,value){
setGeoJson(value.gtn);
$('#messages').html(value.someotherkey);
})
},
dataType:'json'
});
like this you can append or do any thing you like..