file_get_contents occasionally causes warning, but still fetches data - php

Question

My script is working most of the times, but in every 8th try or so I get an error. I'll try and explain this. This is the error I get (or similar):
{"gameName":"F1 2011","gameTrailer":"http://cdn.akamai.steamstatic.com/steam/apps/81163/movie_max.webm?t=1447354814","gameId":"44360","finalPrice":1499,"genres":"Racing"}
{"gameName":"Starscape","gameTrailer":"http://cdn.akamai.steamstatic.com/steam/apps/900679/movie_max.webm?t=1447351523","gameId":"20700","finalPrice":999,"genres":"Action"}
Warning: file_get_contents(http://store.steampowered.com/api/appdetails?appids=400160): failed to open stream: HTTP request failed! in C:\xampp\htdocs\GoStrap\game.php on line 19
{"gameName":"DRAGON: A Game About a Dragon","gameTrailer":"http://cdn.akamai.steamstatic.com/steam/apps/2038811/movie_max.webm?t=1447373449","gameId":"351150","finalPrice":599,"genres":"Adventure"}
{"gameName":"Monster Mash","gameTrailer":"http://cdn.akamai.steamstatic.com/steam/apps/900919/movie_max.webm?t=1447352342","gameId":"36210","finalPrice":449,"genres":"Casual"}
I'm making an application that fetches information on a random Steam game from the Steam store. It's quite simple.
The script takes a (somewhat) random ID from a text file (working for sure)
The ID is added to the ending of an URL for the API, and uses file_get_contents to fetch the file. It then decodes json. (might be the problem somehow)
Search for my specified data. Final price & movie webm is not always there, hence the if(!isset())
Decide final price and ship back to ajax on index.php
The error code above suggests that I get the data I need in 4 cases, and an error once. I only wanna receive ONE json string and return it, and only in-case $game['gameTrailer'] and $game['final_price'] is set.
This is the php (it's not great, be kind):
<?php
//Run the script on ajax call
if(isset($_POST)) {
fetchGame();
}
function fetchGame() {
$gameFound = false;
while(!$gameFound) {
////////// ID-picker //////////
$f_contents = file("steam.txt");
$url = $f_contents[mt_rand(0, count($f_contents) - 1)];
$answer = explode('/',$url);
$gameID = $answer[4];
$trimmed = trim($gameID);
////////// Fetch game //////////
$json = file_get_contents('http://store.steampowered.com/api/appdetails?appids='.$trimmed);
$game_json = json_decode($json, true);
if(!isset($game_json[$trimmed]['data']['movies'][0]['webm']['max']) || !isset($game_json[$trimmed]['data']['price_overview']['final'])) {
continue;
}
$gameFound = true;
////////// Store variables //////////
$game['gameName'] = $game_json[$trimmed]['data']['name'];
$game['gameTrailer'] = $game_json[$trimmed]['data']['movies'][0]['webm']['max'];
$game['gameId'] = $trimmed;
$game['free'] = $game_json[$trimmed]['data']['is_free'];
$game['price'] = $game_json[$trimmed]['data']['price_overview']['final'];
$game['genres'] = $game_json[$trimmed]['data']['genres'][0]['description'];
if ($game['free'] == TRUE) {
$game['final_price'] = "Free";
} elseif($game['free'] == FALSE || $game['final_price'] != NULL) {
$game['final_price'] = $game['price'];
} else {
$game['final_price'] = "-";
}
}
////////// Return to AJAX (index.php) //////////
echo
json_encode(array(
'gameName' => $game['gameName'],
'gameTrailer' => $game['gameTrailer'],
'gameId' => $game['gameId'],
'finalPrice' => $game['final_price'],
'genres' => $game['genres'],
))
;
}
?>
Any help will be appreciated. Like, are there obvious reason as to why this is happening? Is there a significantly better way? Why is it re-iterating itself at least 4 times when it seems to have fetched that data I need? Sorry if this post is long, just trying to be detailed with a lacking php/json-vocabulary.
Kind regards, John
EDIT:
Sometimes it returns no error, just multiple objects:
{"gameName":"Prime World: Defenders","gameTrailer":"http://cdn.akamai.steamstatic.com/steam/apps/2028642/movie_max.webm?t=1447357836","gameId":"235360","finalPrice":899,"genres":"Casual"}
{"gameName":"Grand Ages: Rome","gameTrailer":"http://cdn.akamai.steamstatic.com/steam/apps/5190/movie_max.webm?t=1447351683","gameId":"23450","finalPrice":999,"genres":"Simulation"}