Extract Sum of 'Revenue' from Array - php

Question

I have an array which is a lis, how would I sum the revenue from the specific dates? Please see code below or here https://3v4l.org/eUavL
Like this:
2018-10-28-29.02 USD
2018-10-29-34.73 USD
2018-10-30-27.22 USD
== Sum 90.97 USD
Thanks so much from help!!
<?php
$curl_response = '{
"options": {
"ranking_metric": "paid_impressions",
"time_interval": "day",
"report_type": "time",
"filters": {
"pid": "2759"
},
"data_source": "detailed",
"format": "json",
"end_date": "2018-10-28 23:59",
"columns": ["paid_impressions", "revenue"],
"time_zone": "UTC",
"start_date": "2018-10-26 00:00"
},
"api_url": "http://udmserve.com/udm/radalytics_api.cpx?action=report&api_key=xxxx&api_key=xxxx",
"time": 1540989662,
"rows": [{
"paid_impressions": "18136",
"timestamp": "2018-10-26 00:00",
"_combined_val": "",
"ranking_col": "49046",
"revenue": "28.461629999999985",
"rank": "1",
"f0_": ""
}, {
"paid_impressions": "14432",
"timestamp": "2018-10-27 00:00",
"_combined_val": "",
"ranking_col": "49046",
"revenue": "25.707970000000017",
"rank": "1",
"f0_": ""
}, {
"paid_impressions": "16478",
"timestamp": "2018-10-28 00:00",
"_combined_val": "",
"ranking_col": "49046",
"revenue": "29.07676000000002",
"rank": "1",
"f0_": ""
}]
}';
$array = json_decode($curl_response,true);
foreach($array['rows'] as $arr){
echo explode(' ',$arr['timestamp'])[0].'-'.number_format((float)$arr['revenue'], 2, '.', '').' USD'.PHP_EOL;
}
Code also here: https://3v4l.org/eUavL

Answer 1

Just keep a running total as you iterate.
Code: (Demo)
$array = json_decode($curl_response,true);
$sum = 0;
foreach ($array['rows'] as $set) {
$sum += $revenue = number_format((float)$set['revenue'], 2, '.', '');
echo explode(' ', $set['timestamp'])[0] , "-$revenue USD\n";
}
echo "\t== " , number_format((float)$sum, 2, '.', '') , " USD";
Output:
2018-10-26-28.46 USD
2018-10-27-25.71 USD
2018-10-28-29.08 USD
== 83.25 USD
*note, this keeps adding the number_formatted values. If you require higher specificity -- that is, you want to add up the longer float values and then only format the total once at the end, I can code that up too.