What potential issues can arise when multiple users try to write to a text file simultaneously in PHP?

When multiple users try to write to a text file simultaneously in PHP, potential issues such as data corruption, race conditions, and file locking conflicts may arise. To solve this problem, you can use file locking mechanisms to ensure that only one user can write to the file at a time. 

$filename = 'data.txt';
$file = fopen($filename, 'a+');

if (flock($file, LOCK_EX)) {
    fwrite($file, "Data to be written\n");
    flock($file, LOCK_UN);
} else {
    echo "Couldn't lock the file!";
}

fclose($file);

Keywords

concurrency file locking race condition fopen fwrite

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