How to modify json to validate it? - php

Question

I am downloading some json and merging them, but while doing that it creates a string like below,
}
][
{
I'd like to replace that with a comma in order to have a valid json
I tried something like this but it's not working:
$datas = array();
$json = str_replace("][",",", $datas);
$json = json_encode($json, JSON_PRETTY_PRINT);
print_r($json);
If I can manage to do that I'd use the same to replace columns name (I'm actually building this json from a csv) if possible.
UPDATE
To clarify I have multiple csv(s) from which I am then building a single json
FULL CODE
header('Content-Type: application/json');
$arr = array("04-12-2020",
"04-13-2020",
"04-14-2020",
"04-15-2020",
"04-16-2020",
"04-17-2020",
"04-18-2020",
"04-19-2020",
"04-20-2020",
"04-21-2020",
"04-22-2020",
"04-23-2020",
"04-24-2020",
"04-25-2020",
"04-26-2020",
"04-27-2020",
"04-28-2020",
"04-29-2020",
"04-30-2020",
"05-01-2020",
"05-02-2020",
"05-03-2020",
"05-04-2020",
"05-05-2020",
"05-06-2020",
"05-07-2020",
"05-08-2020",
"05-09-2020",
);
foreach($arr as $date) {
$url = "https://raw.githubusercontent.com/CSSEGISandData/COVID-19/master/csse_covid_19_data/csse_covid_19_daily_reports_us/".$date.".csv";
if (($handle = fopen($url, "r")) !== FALSE) {
$csvs = [];
while(! feof($handle)) {
$csvs[] = fgetcsv($handle);
}
$datas = [];
$column_names = [];
foreach ($csvs[0] as $single_csv) {
$column_names[] = $single_csv;
}
foreach ($csvs as $key => $csv) {
if ($key === 0) {
continue;
}
foreach ($column_names as $column_key => $column_name) {
$datas[$key-1][$column_name] = $csv[$column_key];
}
}
$json = json_encode($datas, JSON_PRETTY_PRINT);
fclose($handle);
print_r($json);
}
}

Answer 1

Don't call json_encode() inside the loop. Initialize $datas outside the loop, and encode it after the loop.
$datas = [];
foreach($arr as $date) {
$url = "https://raw.githubusercontent.com/CSSEGISandData/COVID-19/master/csse_covid_19_data/csse_covid_19_daily_reports_us/".$date.".csv";
if (($handle = fopen($url, "r")) !== FALSE) {
$csvs = [];
while($row = fgetcsv($handle)) {
$csvs[] = $row;
}
$column_names = [];
// Use header line to get array keys
foreach ($csvs[0] as $single_csv) {
$column_names[] = $single_csv;
}
array_shift($csvs); // remove header line
foreach ($csvs as $key => $csv) {
$new_data = [];
foreach ($column_names as $column_key => $column_name) {
$new_data[$column_name] = $csv[$column_key];
}
$datas[] = $new_data;
}
fclose($handle);
}
}
$json = json_encode($datas, JSON_PRETTY_PRINT);
print_r($json);