How can PHP manage multiple visitors accessing a file simultaneously?

When multiple visitors access a file simultaneously in PHP, it can lead to race conditions and data corruption. To manage this, you can use file locking mechanisms to ensure that only one visitor can write to the file at a time. PHP provides functions like `flock()` to implement file locking and prevent concurrent writes. 

$fp = fopen('file.txt', 'a+');
if (flock($fp, LOCK_EX)) {
    // Perform operations on the file
    fwrite($fp, "Data to write\n");
    flock($fp, LOCK_UN); // Release the lock
} else {
    echo "Could not lock the file.";
}
fclose($fp);

Keywords

concurrency file locking session management PHP functions race conditions

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