Reformat json in a correct way - php

Question

I have this php code as I am trying to execute a particular function in my php project, I code the implementation correct but I ran into a small problem.
<?php echo '<script type="text/javascript">';
$data = array(
'base' => 'USD',
'alter' => 'ETH',
'data' => array()
);
foreach ($cryptos as $row) {
$sy = $row["symbol"];
$data['data'][] = array(
"$sy" => [
"rate" => 1.552000000000000,
"min" => 1.0077600000000000,
"max" => 10.077600000000000,
"code" => $row["symbol"],
"dp" => 8
],
);
}
print_r("var fxCur = " . json_encode($data));
Running the code above I got this result below, That's the expected result but I want to omit [] between data
{
"base":"USD",
"alter":"ETH",
"data":[
{
"BTC":{
"rate": 1.552000000000000,
"min": 1.0077600000000000,
"max": 10.077600000000000,
"code":"BTC",
"dp":8
}
},
{
"ETH":{
"rate": 1.552000000000000,
"min": 1.0077600000000000,
"max": 10.077600000000000,
"code":"ETH",
"dp":8
}
}
]
}
But actually I wanted this result
{
"base":"USD",
"alter":"ETH",
"data":{
"BTC":{
"rate": 1.552000000000000,
"min": 1.0077600000000000,
"max": 10.077600000000000,
"code":"BTC",
"dp":8
},
"ETH":{
"rate": 1.552000000000000,
"min": 1.0077600000000000,
"max": 10.077600000000000,
"code":"ETH",
"dp":8
},
}
}

Answer 1

You're telling it to construct the data structure that way.
$data['data'][] = array(
"$sy" => [
...
]
);
That line says "append an element to $data['data'] at the next integer index and set it equal to the array e.g. [ "BTC" => [ ... ]]
I think what you want is:
$data['data'][$sy] = [
"rate" => 1.552000000000000,
"min" => 1.0077600000000000,
"max" => 10.077600000000000,
"code" => $row["symbol"],
"dp" => 8
];