JSON php extract data (where a statement is true) - php

Question

I'm trying to catch specific data from a weather forecast API request (JSON output). The request gives me data for the next 3 days but I only need the next day. Here a snippet of the output:
array (
'cod' => '200',
'message' => 0.00259999999999999988065102485279567190445959568023681640625,
'cnt' => 40,
'list' =>
array (
0 =>
array (
'dt' => 1526461200,
'main' =>
array (
'temp' => 292.93000000000000682121026329696178436279296875,
'temp_min' => 292.05000000000001136868377216160297393798828125,
'temp_max' => 292.93000000000000682121026329696178436279296875,
'pressure' => 1019.259999999999990905052982270717620849609375,
'sea_level' => 1029.170000000000072759576141834259033203125,
'grnd_level' => 1019.259999999999990905052982270717620849609375,
'humidity' => 71,
'temp_kf' => 0.88000000000000000444089209850062616169452667236328125,
),
'weather' =>
array (
0 =>
array (
'id' => 802,
'main' => 'Clouds',
'description' => 'scattered clouds',
'icon' => '03d',
),
),
'clouds' =>
array (
'all' => 36,
),
'wind' =>
array (
'speed' => 4.20000000000000017763568394002504646778106689453125,
'deg' => 37.00240000000000151203494169749319553375244140625,
),
'sys' =>
array (
'pod' => 'd',
),
'dt_txt' => '2018-05-16 09:00:00',
),
1 =>
array (
'dt' => 1526472000,
'main' =>
array (
'temp' => 293.6100000000000136424205265939235687255859375,
'temp_min' => 292.95800000000002683009370230138301849365234375,
'temp_max' => 293.6100000000000136424205265939235687255859375,
'pressure' => 1019.799999999999954525264911353588104248046875,
'sea_level' => 1029.65000000000009094947017729282379150390625,
'grnd_level' => 1019.799999999999954525264911353588104248046875,
'humidity' => 66,
'temp_kf' => 0.66000000000000003108624468950438313186168670654296875,
),
'weather' =>
array (
0 =>
array (
'id' => 803,
'main' => 'Clouds',
'description' => 'broken clouds',
'icon' => '04d',
),
),
'clouds' =>
array (
'all' => 56,
),
'wind' =>
array (
'speed' => 5.79999999999999982236431605997495353221893310546875,
'deg' => 38.0009000000000014551915228366851806640625,
),
'sys' =>
array (
'pod' => 'd',
),
'dt_txt' => '2018-05-16 12:00:00',
)
I'm trying to get the 'all' values where 'dt_txt' starts from 0am the next day to 0pam the day after.
For now I'm using the following php code without checking for dt_txt:
<?php
$url = "http://api.openweathermap.org/data/2.5/forecast?q=D%C3%BClmen,de&mode=json";
$response = file_get_contents($url);
$obj = json_decode($response);
$t = 0;
$regen = 0;
$regendiv = 0;
for($i=0; $i < 10; $i++) {
$fg = $obj->list[$i]->clouds->all;
$regen += $fg;
}
echo $regen;
?>
My code requires me to run the request at a specific time (like close to midnight) in order to catch the 'all' values for the next day. Is there any way to check for 'dt_text' = the next day?
My Idea would be something like this:
for($i=0; $i < 10; $i++) {
$fg = $obj->list[$i]->clouds->all;
if (strpos($obj->list[$i]->dt_txt), $date){
$regen += $fg;
}
**//But how do I get $date to be the following day**
}
echo $regen;
?>

Answer 1

I was able to solve it this way:
<?php
$nextWeek = time() + (24 * 60 * 60);
$morgen = date('Y-m-d', $nextWeek);
$url = "http://api.openweathermap.org/data/2.5/forecast?q=D%C3%BClmen,de&mode=json";
$response = file_get_contents($url);
$obj = json_decode($response);
$quote = 0;
for($i=0; $i < 14; $i++) {
if (strpos($obj->list[$i]->dt_txt, $morgen) !== false) {
$fg = $obj->list[$i]->clouds->all;
if($fg > 80) { $t = 1; }
$regen += $fg;
$quote++;
}
}
$regendiv = $regen / $quote;
?>
Probably not the prettiest way but it gets the job done.