How can the concept of a "street for only one car at a time" be applied to handling multiple clients in a PHP server script?

To handle multiple clients in a PHP server script like a "street for only one car at a time," we can use a locking mechanism to ensure that only one client can access a critical section of code at a time. This can prevent race conditions and ensure data integrity when multiple clients are accessing shared resources. 

<?php

$lockFile = fopen("lock.txt", "w");

if (flock($lockFile, LOCK_EX)) {
    // Critical section of code
    // Only one client can access this code block at a time

    flock($lockFile, LOCK_UN); // Release the lock
} else {
    echo "Could not acquire lock.";
}

fclose($lockFile);

?>

Keywords

concurrency threading mutex semaphore parallel processing

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