How can a unique user ID be assigned to users in PHP for identification purposes?

To assign a unique user ID to users in PHP for identification purposes, you can use PHP's built-in function uniqid() which generates a unique ID based on the current time in microseconds. This ID can be stored in a database or session variable to identify users across different pages or sessions. 

// Assign a unique user ID to the user
$userID = uniqid();

// Store the user ID in a session variable
$_SESSION['userID'] = $userID;

// Alternatively, store the user ID in a database for persistent identification
// $db->query("INSERT INTO users (userID) VALUES ('$userID')");

Keywords

PHP unique user ID identification session authentication

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