how to pass variables "$tid, $id" into raw function? - mongodb

Question

when i call $id and $tid in raw function to fetch some data from sub document of mongodb collection it show me an error these two variables are undefined($tid,$id)?
<?php
$id=IntValue;
$tId=IntValue;
if($tId==0)
{
$maxPlayers=0;
}
else
{
$result = DB::collection('PrizeDistributionTemplate')->raw(function($collection)
{
return $collection->aggregate(array(
array(
'$match' => array( 'id' => $id,'templates.tId' => $tid)
),
array( '$unwind' => '$templates' ),
array(
'$match' => array( 'id' => $id,'templates.tId' => $tid)
),
));
});
$result=json_decode(json_encode($result),true);
$maxPlayers=$result['result'][0]['templates']['maxPlayers'];
$maxPlayers=intval($maxPlayers)+2;
}
?>

Answer 1

When you use a callback function in PHP, the function as it own scope and can't access variables from outside of it's scope.
$foo = true;
DB::collection('something')->raw(function ($collection) {
echo $foo;// $foo is undefined here, this create an error
});
echo $foo;// here it work
But you can feed your callback with variables using the PHP use keyword:
$foo = true;
DB::collection('something')->raw(function ($collection) use ($foo) {
echo $foo;// now it works
});

Answer 2

It will work great with bulk addition, this way you just need to create on array and pass it.
$temp = [
[
'item' => "envelopes"
],
[
'item' => "envelopesas"
],
[
'item' => "lala"
]
];
$userData = DB::table('log') - > raw(function ($collection) use($temp)
{
return $collection - > insertMany($temp);
});