Cross compare two sets of data - php

Question

I have a report table. A report can have many documents (which are csv file paths). A document has many mappings.
So I initially loop my documents for a report and load the csv data using ParseCsv
foreach ($this->report->uploadedDocuments->documents as $document) {
$csv = new ParseCsv\Csv();
$csv->limit = 1;
$csv->parse(storage_path("app/" . $document->fullName));
$this->csvData = $csv->data;
}
If I output this, I see something like the following for each document (only showing one CSV row here from one document)
[
{
"id":"1",
"field1":"Some data",
"something":"Some data",
"something":"Some data",
"something":"Some data",
"something":"Some data",
}
]
Now each document has mappings so I can also do something like this
foreach ($this->report->uploadedDocuments->documents as $document) {
//Load CSV data
foreach ($document->mappings as $column) {
Log::debug(json_encode($column));
}
}
The output for the above is something like this
{
"document_id":"6434fc74-18f7-43ff-be33-3a8b0cf1cadc",
"field1":1,
"field2":null,
"field3":null,
"created_at":"2020-10-26T10:19:36.000000Z",
"updated_at":"2020-10-26T10:19:36.000000Z"
}
So from the above, I can see that field1 is located in column (index) 1 in the csv data. I can also see that this CSV does not have a field2 or field3. So my idea is to turn the original CSV data into this
[
{
"field1":"Some data",
}
]
So this is my thinking. I first need to loop the documents for the reports, load the CSV files, and read the data
foreach ($this->analysis->uploadedDocuments->documents as $document) {
$csv = new ParseCsv\Csv();
$csv->limit = 5;
$csv->parse(storage_path("app/" . $document->fullName));
if (empty($csv->data)) {
throw new Exception('Not data found in file.');
}
foreach ($csv->data as $dataKey => &$item) {
foreach ($item as $key => $value) {
//Now I have access to the keys and values from csv
}
}
}
But then how can I cross check this against my document mappings? I obviously have to loop the mappings but where should I do this? I have something which I think could work but it is very messy, and relies on my knowing the column names e.g.
foreach ($this->report->uploadedDocuments->documents as $document) {
$csv = new ParseCsv\Csv();
$csv->limit = 5;
$csv->parse(storage_path("app/" . $document->fullName));
if (empty($csv->data)) {
throw new Exception('Not data found in file.');
}
foreach ($document->mappings as $column) {
foreach ($csv->data as $dataKey => &$item) {
foreach ($item as $key => $value) {
//match the mapping column to the csv column
if ($column->fieldOne !== NULL && $key === $column->fieldOne) {
//now I have access to the values for that column
}
}
}
}
}
Would there be a better way of achieving something like this?
Thanks

Answer 1

I suggest the following as I understand from your question
<?PHP
$csvData = $csv->data;
$csvData = json_encode($csvData);
$arr = json_decode($csvData, true);
$field1 = array_column($arr, "field1");
print_r($field1);
?>
This line convert object into json string
$csvData = json_encode($csvData);
This line convert json string to pure array
$arr = json_decode($csvData, true);
This line extract column value from multidimensional array
$field1 = array_column($arr, "field1");
I hope this will work.