Use PHP to parse INI file and run JSON_DECODE - php

Question

I'm looking to get some input on how to make modular code that performs a PHP parse_ini_file and then uses the returned values to run JSON decodes.
I have a BACnet API that returns a JSON structure for BACnet points in an automation system. I wrote the following code to decode the JSON data to return just the "present-value" field and then I display the value on a webpage.
<?php
$url = "http://hostname.lcl:47800/api/v1/bacnet/devices/10100/objects/0.0";
$json = file_get_contents($url);
$json_data = json_decode($json, true);
echo "<b>Room temperature</b>: ". $json_data["present-value"]. " DEG F";
;?>
This works well but I want to make this code modular so it can be used for many other points.
I created an INI file with a list of other points and the URL that contains the JSON data from the API.
## BACnet Configuration File
# BACnet Object URLs from WACNET Browser API
[bacnet]
SEA_RMT = http://hostname.lcl:47800/api/v1/bacnet/devices/10100/objects/0.0
SEA_SRV_SEA_SV1_01_EXHT = http://hostname.lcl:47800/api/v1/bacnet/devices/10100/objects/0.3
SEA_SRV_SEA_SV1_02_EXHT = http://hostname.lcl:47800/api/v1/bacnet/devices/10100/objects/0.4
SEA_SRV_SEA_SV1_03_EXHT = http://hostname.lcl:47800/api/v1/bacnet/devices/10100/objects/0.5
What I'd like to do is use the INI file to get the present value of each point in the list and then create a variable that is the name of the point and set it equal to the "present-value" field. Then I can reference the point using the PHP variable on the HTML page like this:
<?php echo "$SEA_SRV_SEA_SV1_01_EXHT";?>
I started with the code below but it doesn't work.
<?php
// Parse the settings file
$bacnetini = parse_ini_file('/var/www/config/bacnet.ini');
// Parse the keys to variables and add data
foreach ($bacnetini as $key => $value) {
$url = $value;
$json = file_get_contents($url);
$json_data = json_decode($json, true);
$$key = $json_data;
}
?>
I'd love to get some other opinions on the best way to accomplish this since I don't really know where to go from here.
I've looked through these other Stack Overflow questions but I don't know how to get the pieces to all fit together.
Parsing a config file in php to variables
Get JSON object from URL

Answer 1

Why not try something like this instead? This will allow you to create other sections in your INI file that won't affect your script.
<?php
$bacnetini = parse_ini_file('/var/www/config/bacnet.ini', true);
$data = array();
foreach ($bacnetini['bacnet'] as $key => $url) {
$data[$key] = json_decode(file_get_contents($url), true);
}
var_dump($data['SEA_SRV_SEA_SV1_01_EXHT']);
?>