What are the potential pitfalls of using touch() to create a lockfile for handling file access concurrency in PHP?

Potential pitfalls of using touch() to create a lockfile for handling file access concurrency in PHP include the possibility of race conditions if multiple processes try to create the lockfile simultaneously. To solve this issue, you can use file locking mechanisms like flock() to ensure exclusive access to the lockfile.

$lockfile = 'lockfile.lock';

$handle = fopen($lockfile, 'w');
if (flock($handle, LOCK_EX)) {
    // Perform operations that require exclusive access to the file
    flock($handle, LOCK_UN); // Release the lock
} else {
    // Handle the case where the lock could not be acquired
}

fclose($handle);