cURL and json data convert into array and get only temp data - php

Question

I am new using json data. I am trying to call an api using cURL and converting it into array. I just want the temp data using foreach loop. But i am getting Invalid argument supplied for foreach() error. My code
$cSession = curl_init();
curl_setopt($cSession,CURLOPT_URL,"http://api.openweathermap.org/data/2.5/forecast/daily?q=dhaka%2Cbangladesh&mode=json&units=metric&cnt=3");
curl_setopt($cSession,CURLOPT_RETURNTRANSFER,true);
curl_setopt($cSession,CURLOPT_HEADER, false);
$result = curl_exec($cSession);
curl_close($cSession);
//echo $result;
//$i = 3 as i am requesting 3 day data
for ($i=0; $i <3 ; $i++) {
foreach ($result as $value) {
echo $value['temp'][0]['day'];
echo $value['temp'][0]['min'];
echo $value['temp'][0]['max'];
echo $value['temp'][0]['night'];
echo $value['temp'][0]['eve'];
echo $value['temp'][0]['morn'];
}
}

Answer 1

This should work for you:
$json = json_decode($result);
$res = $json->{'list'};
foreach ($res as $value) {
echo $value->{'temp'}->{'day'} . "<br>";
echo $value->{'temp'}->{'min'} . "<br>";
echo $value->{'temp'}->{'max'} . "<br>";
echo $value->{'temp'}->{'night'} . "<br>";
echo $value->{'temp'}->{'eve'} . "<br>";
echo $value->{'temp'}->{'morn'} . "<br>";
}
In your query string you have the value metric&cnt=3 this is what you want for days to be extracted if you get from cnt=10 you will have 10 results. No need for a for loop.

Answer 2

With the curl_exec you'll get a json as a string, you have to parse it first to use it.
Try this: http://php.net/manual/en/function.json-decode.php
And don't forget to set the second parameter to true if you want the result as an array.

Answer 3

the result is JSON that you should parse with json_decode first
edit with more code:
...
$result = json_decode($result,true);
for ($i=0; $i <3 ; $i++) {
foreach ($result['list'] as $value) {
echo $value['temp']['day'];
echo $value['temp']['min'];
...

Answer 4

curl_exec with the option CURLOPT_RETURNTRANSFER set to true will return the result of fetch the url you have set so your variable $result is a STRING.
You hace to convert to an array:
$cSession = curl_init();
curl_setopt($cSession,CURLOPT_URL,"http://api.openweathermap.org/data/2.5/forecast/daily?q=dhaka%2Cbangladesh&mode=json&units=metric&cnt=3");
curl_setopt($cSession,CURLOPT_RETURNTRANSFER,true);
curl_setopt($cSession,CURLOPT_HEADER, false);
$result = curl_exec($cSession);
curl_close($cSession);
$result = json_decode($result,true);
//echo $result;
//$i = 3 as i am requesting 3 day data
for ($i=0; $i <3 ; $i++) {
foreach ($result as $value) {
echo $value['temp'][0]['day'];
echo $value['temp'][0]['min'];
echo $value['temp'][0]['max'];
echo $value['temp'][0]['night'];
echo $value['temp'][0]['eve'];
echo $value['temp'][0]['morn'];
}
}