Store and prepare data in php with specific parameter request url - php

Question

I have seen here this url json response data file from Highstock:
https://www.highcharts.com/samples/data/jsonp.php?filename=msft-c.json
So the data (encoded in json format) taken via GET request changes every time that the filename parameter value is different, for example in our case we can call different data by using these other 2 parameters: aapl-c.json and goog-c.json.
How can be performed in php the same data preparation for store multiple data resources with different filenames values request? And can we call a specific portion of data by using different parameter values? Also a very simple explanation of the logic behind this process would be enough.

Answer 1

I am skipping some verifications here, but the process is quite simple, this is a quite basic GET var analysis. When there is ?varname=value at the end of th URL, PHP gets the variable in the $_GET array. However, it is quite unsafe to use it raw, you should filter it before.
Another advice here is not to try to load a file dynamically from this var value or these kind of things, for security reasons. It is better to only allow desired values (used a switch here that have a quite strange syntax, but if/else fit just the same).
Then with php, you have to create your document with a display, like echo. In this case, it is JSON, so you just have to output your JSON.
Would be something like:
<?php
//sanitize the value from $_GET array
$getVar = filter_input(INPUT_GET, 'filename', FILTER_SANITIZE_STRING);
//do various things depending on value
switch($getVar){
case 'aapl-c.json':
$display = '{ "content": "i am JSON 1" }';
break;
case 'goog-c.json':
$display = '{ "content": "i am JSON 2" }';
break;
default:
$display = '';
}
//send the json data to the document
echo $display;
//terminate script for security
exit;