Evaluating a function inside php with if - php

Question

Im trying to do a loop through a pretty large json file with this function someone else helped me with. But the code below returns with : Warning: Invalid argument supplied for foreach()
This code is executed before the function:
$file = new SplFileObject("bdfile/summoner_leagues_entries_export.json");
while (!$file->eof())
{
$json = json_decode($file->fgets(), true);
var_dump($json);
}
_
function getentry($json)
{
foreach($json as $league)
{
if($league['queue'] == 'RANKED_SOLO_5x5')
{
return $league['entries'][0];
}
return null;
}
}
$entry = getentry($json);
if(isset($entry)) echo $entry['playerOrTeamName'] . ',' . "</br>";
this is the output of var_dump($json); (just a tiny example because its a large file):
{
"_id" : ObjectId("540449a4f59600af7d285075"),
"leagues" : [{
"name" : "Cassiopeia's Hunters",
"tier" : "GOLD",
"queue" : "RANKED_SOLO_5x5",
"entries" : [{
"playerOrTeamId" : "21893177",
"playerOrTeamName" : "JoKoksa",
"division" : "III",
"leaguePoints" : NumberLong(5),
"wins" : NumberLong(99),
"isHotStreak" : false,
"isVeteran" : false,
"isFreshBlood" : false,
"isInactive" : false,
"miniSeries" : false
}],
"id" : NumberLong(21893177)
}, {
"name" : "Kayle's Patriots",
"tier" : "BRONZE",
"queue" : "RANKED_TEAM_3x3",
"entries" : [{
"playerOrTeamId" : "TEAM-ffbaccc0-b8c0-11e2-b67a-782bcb497d6f",
"playerOrTeamName" : "EloStechers",
"division" : "II",
"leaguePoints" : NumberLong(64),
"wins" : NumberLong(9),
"isHotStreak" : false,
"isVeteran" : false,
"isFreshBlood" : false,
"isInactive" : false,
"miniSeries" : false
}],
"id" : NumberLong(21893177)
}, {
"name" : "Cassiopeia's Infiltrators",
"tier" : "BRONZE",
"queue" : "RANKED_TEAM_5x5",
"entries" : [{
"playerOrTeamId" : "TEAM-ffbaccc0-b8c0-11e2-b67a-782bcb497d6f",
"playerOrTeamName" : "EloStechers",
"division" : "II",
"leaguePoints" : NumberLong(60),
"wins" : NumberLong(11),
"isHotStreak" : false,
"isVeteran" : false,
"isFreshBlood" : false,
"isInactive" : true,
"miniSeries" : false
}],
"id" : NumberLong(21893177)
}],
"summonerId" : NumberLong(21893177),
"region" : "euw",
"updatedAt" : NumberLong(1412719896)
}
EDIT 3:
$file = new SplFileObject("bdfile/summoner_leagues_entries_export.json");
while (!$file->eof()) {
$json = json_decode($file->fgets(), true);
foreach($json['leagues'] as $entry) {
echo $entry['entries'][0]['playerOrTeamName'] . ',' . $entry['tier'] . ',' . $entry['entries'][0]['division'] . ',' . $entry['entries'][0]['leaguePoints'] . ',' . $entry['entries'][0]['wins'] . "<br/>";
}
}
$file = null;
EDIT 4:
I got it fixed, if you are interested, i can paste code here.

Answer 1

I think your line in getentry($json)
foreach($json as $league)
should be
foreach($json['leagues'] as $league)

Answer 2

On reflection. That doesn't look like a vardump. Probably $json is just a string when you get into getentry.
Perhaps you need a bson_decode function before you will be able to treat it like a hash (array)
json_decode won't handle it.
There is one in mongo for php.
http://php.net/manual/en/function.bson-decode.php
But it does say "This function is very beta and entirely useless for 99% of users. It is only useful if you're doing something weird, such as writing your own driver on top of the PHP driver."