Avoid inserting duplicate data in csv with PHP

Question

I store data into a csv file by this:

$out = fopen('wpo_stock.csv', 'a');
fputcsv($out, array($order_id,$product_id,$product_name,$product_quantity, $regular_price));
fclose($out);

That stores my data in csv perfectly.
The problem is: Every time the page refreshed, it keeps inserting duplicated datas in the csv file.
How can I avoid inserting duplicated data by order_id (order_id is a unique value in my project)?

Code Updated :

$handle = fopen('wpo_stock.csv', 'r');
while (($data = fgetcsv($handle, ",")) !== FALSE) {
if($data[0] != $order_id){
$out = fopen('wpo_stock.csv', 'a');
fputcsv($out, array($order_id,$product_id,$product_name,$product_quantity, $regular_price));
} break;
}
fclose($handle);

bakis · Accepted Answer · 2019-02-10 12:41:48Z

1

I assume you are trying to override your data all the time when a page refreshes. In that case, you should open your file like this $out = fopen('wpo_stock.csv', 'w');.

But if you are trying to append new data, then you need to read all data from your file and compare with a new one.

answered Feb 10, 2019 at 12:41

bakis

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6 Comments

Poorya Over a year ago

Thanks for answering the [a] is correct because I want append. Exactly, I need to compare new data, but I don't know how to compare csv order_id column with my existing array order_id and if order_id already existing in my csv file don't write them again.

bakis Over a year ago

Read all data from your current CSV file and loop it. Inside loop check if any order IDs exists in a new data array.

Poorya Over a year ago

As you can see in above, I update my code with the way you explain, but now that's not working at all. Am I doing it wrong?

ivanivan Over a year ago

Keep a separate array of "order ids that i've already processed".

Poorya Over a year ago

IvanIvan ,thanks for answering but, I don't get your point can you explain more and specifically?

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