How to create this JSON structure in PHP from my data? [closed] - php

Question

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Closed 10 years ago.
I have a multiple time series in a MySQL database that I am fetching with PHP
(fetch_assoc) .
Each series has the same X axis but different Y axes.
X axis: datetime (POSIX values).
Y axes:
air_temperature
dew_point_temperature
sea_level_pressure
wind_direction
wind_speed_rate
sky_condition_total_coverage_code
liquid_precipitation_depth_dimension_one_hr
liquid_precipitation_depth_dimension_six_hr
I need to output this data in a specific JSON structure.
Here is an example of the proper end result:
{ "firstRow" : { "beginTime" : "2012-10-09 00:00:01",
"endTime" : "2012-10-10 00:00:00",
"tMax" : "56.0",
"tMean" : "52.5",
"tMin" : "49.0"
},
"interval" : "daily",
"lastRow" : { "beginTime" : "2012-10-15 00:00:01",
"endTime" : "2012-10-16 00:00:00",
"tMax" : "72.0",
"tMean" : "64.0",
"tMin" : "56.0"
},
"series" : [ { "color" : "#FFAE28",
"data" : [ [ 1349740801000,
56
],
[ 1349827201000,
60
],
[ 1349913601000,
69
],
[ 1350000001000,
61
],
[ 1350086401000,
57
],
[ 1350172801000,
56
],
[ 1350259201000,
72
]
],
"name" : "Maximum Temperature (ºF)",
"type" : "spline",
"yAxis" : 0,
"zIndex" : 100
},
{ "color" : "#4bf827",
"data" : [ [ 1349740801000,
52.5
],
[ 1349827201000,
56
],
[ 1349913601000,
59
],
[ 1350000001000,
55.5
],
[ 1350086401000,
49.5
],
[ 1350172801000,
49.5
],
[ 1350259201000,
64
]
],
"name" : "Mean Temperature (ºF)",
"type" : "spline",
"yAxis" : 0,
"zIndex" : 100
},
{ "color" : "#2dc1f0",
"data" : [ [ 1349740801000,
49
],
[ 1349827201000,
52
],
[ 1349913601000,
49
],
[ 1350000001000,
50
],
[ 1350086401000,
42
],
[ 1350172801000,
43
],
[ 1350259201000,
56
]
],
"name" : "Minimum Temperature (ºF)",
"type" : "spline",
"yAxis" : 0,
"zIndex" : 100
}
],
"title" : "New York Laguardia Arpt: Daily Temperature",
"xAxis" : { "max" : 1350259201000,
"maxZoom" : 604800000,
"min" : 1349740801000
},
"yAxis" : { "endOnTick" : false,
"gridLineColor" : "#777",
"gridLineWidth" : 1,
"labels" : { "enabled" : true,
"style" : { "color" : "#eee" }
},
"lineWidth" : 0,
"max" : null,
"maxPadding" : 0,
"min" : null,
"opposite" : false,
"startOnTick" : true,
"tickInterval" : null,
"title" : { "style" : { "color" : "#eee" },
"text" : "Degrees (Fahrenheit)"
}
}
}
Some help with this would be appreciated!

Answer 1

You need to get the data from the database into a php array with the same structure as the javascript representation you want. Then you can use json_encode($arr_data) to create the javascript representation.
In other words, your $arr_data must end up similar to this:
$arr_data = array(
"firstRow" => array(
"beginTime" => "2012-10-09 00:00:01",
"endTime" => "2012-10-10 00:00:00",
"tMax" => "56.0",
"tMean" => "52.5",
"tMin" => "49.0"
),
"interval" => "daily",
"lastRow" => array(
"beginTime" => "2012-10-15 00:00:01",
"endTime" => "2012-10-16 00:00:00",
"tMax" => "72.0",
"tMean" => "64.0",
"tMin" => "56.0"
),
"series" => array(
array(
"color" => "#FFAE28",
"data" => array(
array(1349740801000, 56),
array(1349827201000, 60),
etc...
),
"name" => "Maximum Temperature (ºF)",
"type" => "spline",
etc....
)
)
);
So, you must write a loop to create this php array, maybe something like this (depending on your db fields):
if ($result = $mysqli->query($query)) {
$arr_data = array();
$i = 0;
while ($row = $result->fetch_assoc()) {
$arr_firstRow = array();
$arr_firstRow["beginTime"] = $row["beginTime"];
$arr_firstRow["endTime"] = $row["endTime"];
etc...
$arr_data[$i]["firstRow"] = $arr_firstRow;
$arr_data[$i]["interval"] = $row["interval"];
etc...
$i++;
}
}
And then, you can use json_encode($arr_data).

Answer 2

Have a look at json_encode/json_decode as it will do what you're looking for.
Translation:
JSON=>PHP
json_decode the data and PHP will create the structure using the same outline.
PHP=>JSON
Create the structure using PHP objects then call json_encode to output the information.
If some manipulation needs to be done before you can encode it, you'll have to do it. Judging by the wording of your question the database isn't a direct 1-to-1 translation to JSON (so you'll need to use the data to create the structure first, then pass that structure to the encoder).