Compare CSV line in php - php

Question

I have the following code that allows me to generate a csv file from my database.
<?php
require_once 'dbconfig.php';
try {
$pdo = new PDO("mysql:host=$host;dbname=$dbname", $username, $password);
$sql = 'SELECT o.id_order ,c.id_customer, c.firstname, c.lastname, a.address1, a.address2, a.postcode, a.city,a.phone,c.email,a.phone_mobile, od.product_id, od.product_name,od.product_quantity, od.product_price,o.total_paid_tax_incl, c.id_customer, op.date_add, op.amount, op.payment_method
FROM mod582_orders o
INNER JOIN mod582_customer c ON o.id_customer = c.id_customer
INNER JOIN mod582_address a ON o.id_address_delivery = a.id_address
INNER JOIN mod582_order_detail od ON o.id_order = od.id_order
INNER JOIN mod582_order_payment op ON o.reference = op.order_reference
WHERE CAST(o.date_add AS DATE) LIKE "2023-01%" /*CAST( curdate() AS DATE)*/;
';
$r = $pdo->query($sql);
$tab = \[\];
$tab\[\] = \['ORDNOORDER', 'ORDREFCUSORDER', 'ORDNOCOSTNUMBER','ORDNOCUSTOMER','ORDCUSTOMERCODE','ORDCUSCAT','ORDTYPE','ORDCURRENCY','ORDCURRENCYRATE','ORDDESIGNATION','ORDREPCODE','ORDPORT','ORDPORTTYPE','ORDPORTRATE','DEONOORDER','DEOCOMMENT','DEOCOUNTRY','DEONAME','DEOFIRSTNAME','DEOADDRESS1','DEOADDRESS2','DEOZIPCODE','DEOCITY','DEOPHONE','DEOMAIL','DEOPHONEPORTABLE','ODLNOORDER','ODLNOORDERLINE','ODLNOARTICLE','ODLARTDESIGN','ODLQUANTITYORDER','ODLTTCCURUPRICE','ODLCODEPARCELLEFLEU','PAYNUMPAYMENT','PAYNOCUSTOMER','PAYNOORDER','PAYNOCURRENCY','PAYDATEPAYMENT','PAYPAYMENTTTCCUR','PAYCURRENCYRATE','PAYCONTREPARTIE'\];
$odrline = 1;
while($rs = $r-\>fetch(PDO::FETCH_ASSOC)){
$tab\[\] = \[$rs\['id_order'\], $rs\['id_order'\], '17', '', 'AAA'.$rs\['id_customer'\],'DET','O','EUR','1','','115','D','P','17', $rs\['id_order'\],'','FRA', $rs\['firstname'\], $rs\['lastname'\], $rs\['adress1'\], $rs\['adress2'\], $rs\['postcode'\], $rs\['city'\], $rs\['phone'\], $rs\['email'\], $rs\['phone_modile'\], $rs\['id_order'\],$odrline, $rs\['product_id'\], $rs\['product_name'\], $rs\['product_quantity'\], $rs\['product_price'\],'','','', $rs\['id_order'\],'EUR', $rs\['date_add'\], $rs\['amount'\],'1','VIR'\];
}
$fichier_csv = new SplFileObject('vinistoria/commandes.csv', 'w');
foreach($tab as $ligne){
$fichier_csv-\>fputcsv($ligne, ';');
}
$date = date('d-m-y h:i:s');
echo "nouveau fichier commandes.csv créé à ". $date;
} catch (PDOException $e) {
die("Could not connect to the database $dbname :" . $e-\>getMessage());
}
?\>
However I have some fields that need to change depending on the value of a field in the previous line of my csv.
For example :
my odrline value is 1 for all rows where the value of $rs['id_order'] is 486 but if on the next row $rs['id_order'] is 487 odrline should be 2 etc..
How can I go through my file and change the value based on a field in a previous line?
How can I go through my file and change the value based on a field in a previous line?

Answer 1

Rather than going through the file after it is created to change data, process the data before creating the file.
Store the id_order in a variable and compare at the start of each loop iteration.
Something like:
$odrline = 0; // start with zero, as incremented before first written out
$prevordernumber = 0; // pick a number that is not a valid order number
// or empty string if not numeric
while($rs = $r->fetch(PDO::FETCH_ASSOC)){
// if order number has changed then increment order line
if($prevordernumber != $rs['id_order']) $odrline++;
$tab [] = ........
// update stored previous order number
$prevordernumber = $rs['id_order'];
}
// write $tab to file
$fichier_csv = new SplFileObject('vinistoria/commandes.csv', 'w');
foreach($tab as $ligne){
$fichier_csv-\>fputcsv($ligne, ';');