Error when trying to echo an array - php

Question

I've got a problem. I can't find a proper array in this json file. When i try this:
<?php
$jsonurl = "http://steamcommunity.com/profiles/76561198132044757/inventory/json/304930/2";
$json = file_get_contents($jsonurl);
$arJson = json_decode( $json, true );
echo $arJson[0]
?>
it says:
Notice: Undefined offset: 0
or if i try this:
echo $arJson["rgInventory"]
it says:
Notice: Array to string conversion
Where are the arrays in my json file and how to adress them?
Thank you in advance and sorry for my bad english ;)
Jonas

Answer 1

Notice: Undefined offset: 0
You get this error because your array is an associative array, that mean's there is no index 0. For more info take a look at the docs.
Notice: Array to string conversion
You get this error, because echo can only output strings not arrays
to see what's in your array, you can use var_dump()
<?php
$jsonurl = "http://steamcommunity.com/profiles/76561198132044757/inventory/json/304930/2";
$json = file_get_contents($jsonurl);
$arJson = json_decode( $json, true );
echo "<pre>";
var_dump( $arJson );
$arJson["rgInventory"] is also an array so you can see the values with:
var_dump( $arJson["rgInventory"] );

Answer 2

1) First of all, you should read Steam API documentation to know the structure of coming data.
https://steamcommunity.com/dev
2) Use print_r and var_dump functions to see the structure of your variables.
For example <pre> <? print_r($arJson) ?>

Answer 3

you have to use print_r in order to print an array.
See your result with
echo '<pre>';print_r($arJson);