How does PHP handle the simultaneous access of multiple users on a web server?

PHP handles the simultaneous access of multiple users on a web server by utilizing session handling mechanisms. Sessions allow PHP to store user-specific data across multiple pages, ensuring that each user's interactions are isolated and independent of others. By using session variables, PHP can maintain state information for each user and prevent conflicts between multiple users accessing the same resources simultaneously. 

session_start();

// Accessing session variables
$_SESSION['user_id'] = 123;

// Retrieving session data
$user_id = $_SESSION['user_id'];

// Destroying a session
session_destroy();

Keywords

concurrency PHP sessions locking mechanisms race conditions session handling

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