I have a loop which process a JSON
string via json_decode
.
I am trying to perform some math calculations on a value before I pass it to my table. At the moment I can echo the desired output inside the loop using echo $mileage1.";";
but I need to change the key lc
to the division of 1000
.
There must be a way to do it inside the foreach
statement, not in the block: something like foreach(json_decode($url2, true)['status'] ($status["lc"] / 1000) as $status)
for example where ($status["lc"] / 1000)
does the math outside the loop block.
I haven't been able to find any examples of this specific situation so far. Any suggestions will be greatly appreciated.
Here is a snipplet of my code:
$ret_array = array();
$url2 = file_get_contents("http://URLApi?");
foreach(json_decode($url2, true)['status'] as $status){
//mileage maths??
$mileage = $status["lc"];
$mileage1 = ($mileage) / 1000;
//echo $mileage1.";";
$ret_array[] = $status;
}
return $ret_array;
There are three options to replace the value in the array with the calculated value in a foreach
:
First, reference &
the value to change it in the original array:
$array = json_decode($url2, true);
foreach($array['status'] as &$status){
$status["lc"] = $status["lc"] / 1000;
}
Second, modify the original array using the key:
$array = json_decode($url2, true);
foreach($array['status'] as $key => $status){
$array['status'][$key]["lc"] = $status["lc"] / 1000;
}
Third, create a new result array:
foreach(json_decode($url2, true)['status'] as $status){
$status["lc"] = $status["lc"] / 1000;
$result[] = $status;
}
// Or if you need to preserve keys:
foreach(json_decode($url2, true)['status'] as $key => $status){
$status["lc"] = $status["lc"] / 1000;
$result[$key] = $status;
}
You could also map each element to a function that does the calculation:
$result = array_map(function($v) { return $v['lc'] = $v['lc'] / 1000; },
json_decode($url2, true)['status']);
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