convert csv file to json object with Laravel - json

Question

I am doing a project with Laravel 7. I have to read a csv file and through a controller passing the data in json format to a view.
Unfortunately I don't know how to do that.
These are my controller methods:
public function index($source)
{
$source = strtolower($source);
switch ($source) {
case "csv":
$file_csv = base_path('transactions.csv');
$transactions = $this->csvToJson($file_csv);
dd(gettype($transactions));
return view('transactions', ['source' => $source, 'transactions' => $transactions]);
break;
case "db":
$transactions = Transaction::all();
dd(gettype($transactions));
return view('transactions', ['source' => $source, 'transactions' => $transactions]);
break;
default:
abort(400, 'Bad sintax error.');
}
}
function csvToJson($filename = '', $delimiter = ',')
{
if (!file_exists($filename) || !is_readable($filename)) {
return false;
}
$header = null;
$data = array();
if (($handle = fopen($filename, 'r')) !== false)
{
while (($row = fgetcsv($handle, 1000, $delimiter)) !== false)
{
if (!$header)
$header = $row;
else
$data[] = array_combine($header, $row);
}
fclose($handle);
}
return $data;
}
As you can see, under the two cases I put a dd with a gettype function inside. In the first case I receive uncorrectly the response array, in the second one I receive correctly the response object.
The converted csv file should have this format:
[{"id":1,"code":"T_218_ljydmgebx","amount":"8617.19","user_id":375,"created_at":"2020-01-19T16:08:59.000000Z","updated_at":"2020-01-19T16:08:59.000000Z"},
{"id":2,"code":"T_335_wmhrbjxld","amount":"6502.72","user_id":1847,"created_at":"2020-01-19T16:08:59.000000Z","updated_at":"2020-01-19T16:08:59.000000Z"}]
Do you know how to convert the array transactions into a json object in the first case?

Answer 1

I don't know if there is any build-in solution on Laravel, but it can be done by PHP.
I didn't test my code. So it might not work, or contain some typos, but I'm sure it will give you some directions.
$cols = ["id","code","amount","user_id","created_at","updated_at"];
$csv = file('folder/name.csv');
$output = [];
foreach ($csv as $line_index => $line) {
if ($line_index > 0) { // I assume the the first line contains the column names.
$newLine = [];
$values = explode(',', $line);
foreach ($values as $col_index => $value) {
$newLine[$cols[$col_index]] = $value;
}
$output[] = $newLine;
}
}
$json_output = json_encode($output);

Answer 2

You can just do this :
$csv= file_get_contents($file);
$array = array_map('str_getcsv', explode(PHP_EOL, $csv));
$json json_encode($array);
If you want to return json object
return $json;
If you want to create a .json file
// Pure PHP
$file = fopen('results.json', 'w');
fwrite($file, $json);
fclose($file);
// Laravel using Storage
Storage::disk('local')->put('public/result.json', $json);
I hope this helps somone.

Answer 3

I have an email marketing application where I made bulk importers. So here is their CSV TO JSON code.
function convert_csv_to_json($csv_data){
// CSV to JSON process 1
$context = array(
'http'=>array(
'follow_location' => false,
'max_redirects' => 1000000
)
);
$context = stream_context_create($context);
if (($handle = fopen($csv_data, "r", false, $context)) !== 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];
}
}
return $json = json_encode($datas);
}
// OR
// CSV to JSON process 1
$cols = ['id',
'owner_id',
'name',
'email',
'country_code',
'phone',
'favourites',
'blocked',
'trashed',
'is_subscribed',
'deleted_at',
'created_at',
'updated_at.'];
$csv = file($csv_data);
$output = [];
foreach ($csv as $line_index => $line) {
if ($line_index > 0) { // I assume the the first line contains the column names.
$newLine = [];
$values = explode(',', $line);
foreach ($values as $col_index => $value) {
$newLine[$cols[$col_index]] = $value;
}
$output[] = $newLine;
}
}
return $json_output = json_encode($output);
}