PDO在页面加载时更新数据库

Question

I am building a cms using php,pdo in oop format. On various pages i call functions to update the database on page load in order to keep the database up to date in real time ( Entire site is User content driven things need to be updated and fixed in database outside of forms so i update database on page load for certain things ).

Example

$expiredMatches = $db->fetchAll("SELECT * FROM matches WHERE match_date <= $now AND status = 0");

so the above fetches all matches that need to have their status set to 2 ( expired ) I then loop through each and process point refunds if they are necessary

foreach ($expiredMatches as $em) {
    // Check to see if points were used
         // If ^ Yes then refund users 
}

This may be a dumb question but i have not thought about it much until now. My question is this.

If the page is loaded by multiple users at the same time will the refunded users receive multiple refunds?

Answer 1

Link to PDO transactions manual: http://www.php.net/manual/en/pdo.transactions.php

"any work carried out in a transaction, even if it is carried out in stages, is guaranteed to be applied to the database safely, and without interference from other connections, when it is committed."