Question

Basically it look through the mp3 files in the folder and then insert into mysql database if number does not exist.

Problem is INSERT (mysql) has been inserted more than 1 time but with different member_id‘s with same number. This shouldn’t happen.

4 staffs are executing this scripts. What causing this and how to fix?

if ($handle = opendir($audioPath)) {
    while (false !== ($entry = readdir($handle))) {
        $file = pathinfo($entry);
        if ($entry != "." && $entry != ".." && !is_dir($audioPath . "/" . $entry) && $file['extension'] == 'mp3') {
            $number = $file['filename'];
            $SQL = "SELECT mobile, status, member_id, count(*) as Total from result WHERE number = :number";
            $query = $this->db->prepare($SQL);
            $query->bindValue(":number", $number);
            $query->execute();

            $row = $query->fetch(PDO::FETCH_ASSOC);

            // Check if number is exist in the table
            if ($row['Total'] == 0) {
                $SQL = "INSERT INTO result (number, status, status_date, member_id) VALUES ('$number', 'pending', now(), '$memberId')";
                $queryInsert = $this->db->prepare($SQL);
                $queryInsert->execute();
                break;
            } 
        }
    }
}

after break it play mp3 via media player plugin.

Answer 1

You are probably running into a race condition where two people execute the script simultaneously. When the select is performed, the entry does not exist.

The best way to solve this is to add a UNIQUE constraint on your number field in MySQL. This will make sure the condition is matched at insertion. The query will fail, so you will need to handle the error.