Json path to get api value

Question

How to take the value of low of the following api:

[{"idreg":"257052","code":"USD","codein":"BRL","name":"D\u00f3lar Comercial",      
  "high":"3.4026","pctChange":"1.143","open":"0","bid":"3.3703","ask":"3.3713",  
  "timestamp":"1481828340000","low":"3.367","notFresh":"0","varBid":"0.0381",   
  "create_date":"2016-12-15 17:30:02"}] 

I don’t quite understand what the rules of the road are json but I tried it this way:

<?php    
    $json_file = file_get_contents("https://economia.awesomeapi.com.br/json/USD-BRL/1");   
    $dados = json_decode($json_file);    
    echo $dados->low;
?>

What I’m doing wrong?

Answer 1

You can do it like this:

$json_file = file_get_contents("https://economia.awesomeapi.com.br/json/USD-BRL/1");
$dados = json_decode($json_file);
echo $dados[0]->low; // 3.367

DEMONSTRATION

You can fetch the data as an array as well:

...
$dados = json_decode($json_file, true);
echo $dados[0]['low']; // 3.367

Note that in the data format:

Array
(
    [0] => Array
        (
            [idreg] => 257052
            [code] => USD
            [codein] => BRL
            [name] => Dólar Comercial
            [high] => 3.4026
            [pctChange] => 1.143
            [open] => 0
            [bid] => 3.3703
            [ask] => 3.3713
            [timestamp] => 1481828340000
            [low] => 3.367
            [notFresh] => 0
            [varBid] => 0.0381
            [create_date] => 2016-12-15 17:30:02
        )

)

These are all in key 0 of our main array, and these in turn are an associative array if json_decode($json_file, true) otherwise they are an object by default json_decode($json_file), and you must access $dados[0]->PROPRIEDADE_QUE_QUERES

Answer 2

<?php

$json_file = file_get_contents("https://economia.awesomeapi.com.br/json/USD-BRL/1");   
$dados = json_decode($json_file);

echo $dados[0]->low;


?>