What best practices can be implemented to prevent PHP scripts from running multiple times unexpectedly?

To prevent PHP scripts from running multiple times unexpectedly, one best practice is to use a lock file. This lock file can be created when the script starts running and deleted when it finishes, preventing multiple instances from running simultaneously. 

$lockFile = __DIR__ . '/script.lock';

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

file_put_contents($lockFile, '');

// Your script code here

unlink($lockFile);

Keywords

PHP script prevent running multiple times

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