PHP foreach loop and add values to mysql table

Question

I have an array ($array) which is structured like that:

[auctions] 
       (         
         [0] 
              ( 

                [item]
                        (
                           [id] => 45422
                        )

                [quantity] => 22
                [buyout] => 40
                [bid] => 25
              )

           [1] 
              ( 
                [item]
                         (
                           [id] => 24555
                         )

                [quantity] => 85
                [buyout] =>120
                [bid] => 58
              )

           [2]
         ....

I want to store some of these values in a mysql table. Additionally I want a timestamp and if the item->id already exists in my table (as the primary key) the other values should just get updated.

[item] -> [id]
[quantity]
[buyout] 
TIMESTAMP

I tried it like that:

 foreach ($array['auctions'] as $auctiondata) {

 $sql ="INSERT INTO `blackrock` (`item_id`, `actual_prices`, `actual_quantity`, `last_update`) VALUES ('". $auctiondata['item']['id']."', '". $auctiondata['buyout']."', '". $auctiondata['quantity']."', 'CURRENT_TIMESTAMP')
   ON DUPLICATE KEY UPDATE item_id='". $auctiondata['item']['id']."', '". $auctiondata['buyout']."', '". $auctiondata['quantity']."'";

 }

Answer 1

I suggest you to google "php mysql insert" first There are some references to you

It is no meaning if you update the id when the key duplicated I think you can use REPLACE INTO instead of ON DUPLICATE KEY UPDATE if there are no any operation.

Please note that the old row will be deleted before it make a new row with the same id and the updated data

In addition, curly braces serve good substitution for concatenation PHP is forced to re-concatenate with every '.' operator, slow.

w3schools.com - PHP MySQL Insert Data

PHP Manual - The mysqli class

MySQL 8.0 Reference Manual - REPLACE Statement

<?php

$conn = new mysqli("localhost", "ur_db_username", "ur_db_password", "ur_schema");

if ($conn->connect_error) {
    //
}

foreach ($array['auctions'] as $auctiondata) { {    

    //`actual_prices` = $auctiondata['buyout'] according to your code provided
    //it is no meaning if you update the id when the key duplicated
    //i think you can use REPLACE instead of ON DUPLICATE KEY UPDATE

    $sql = "REPLACE INTO `blackrock` 
                    (`item_id`, `actual_prices`, `actual_quantity`, `last_update`) 
                VALUES 
                    ('{$auctiondata['item']['id']}', '{$auctiondata['buyout']}', '{$auctiondata['quantity']}', NOW())";

    if ($conn->query($sql) === TRUE) {
        //
    } else {
        //
    }
}

$conn->close();
?>

The above if the code mainly copy from the site I provided You need to implement the error handling