What steps can be taken to ensure that a PHP script only runs once, especially when dealing with large amounts of data like in the forum thread?

When dealing with large amounts of data in a PHP script, it is important to ensure that the script only runs once to prevent duplicate processing or data corruption. One way to achieve this is by using a locking mechanism, such as creating a lock file that indicates whether the script is currently running. By checking for the existence of this lock file at the beginning of the script and creating it if it doesn't exist, we can prevent multiple instances of the script from running simultaneously. 

$lockFile = 'script.lock';

if (file_exists($lockFile)) {
    die('Script is already running.');
}

// Create lock file
file_put_contents($lockFile, '');

// Your script logic here

// Remove lock file when script is done
unlink($lockFile);

Keywords

PHP script concurrency locking mechanism database transactions thread safety

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