session_start(); $token = $_SESSION['token'] = session_create_id();
session_start(); if (!isset($_SESSION["csrf_token"])) { $_SESSION["csrf_token"] = bin2hex(random_bytes(32)); }In this example, the random_bytes() function is used to generate a random 32-byte string, which is then converted to hexadecimal format using the bin2hex() function. This string is then stored in the user's session with the key 'csrf_token' using the isset() function to ensure that a token is only generated once per session. The getNewCSRFToken function is part of the PHP session library and is included with all standard PHP installations.