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Get previous Session Identifier OLD_SID from HTTP request. If OLD_SID is null, empty, or no session with SID=OLD_SID exists, create a new session. Generate new session identifier NEW_SID with a secure random number generator. Let session be identified by SID=NEW_SID (and no longer by SID=OLD_SID) Transmit new SID to client. Example:
Since PHP 4.0.1 create_function(), a thin wrapper around eval(), allowed normal PHP functions to be created during program execution; it was deprecated in PHP 7.2 and removed in PHP 8.0 [226] in favor of syntax for anonymous functions or "closures" [227] that can capture variables from the surrounding scope, which was added in PHP 5.3.
PHP has hundreds of base functions and thousands more from extensions. Prior to PHP version 5.3.0, functions are not first-class functions and can only be referenced by their name, whereas PHP 5.3.0 introduces closures. [35] User-defined functions can be created at any time and without being prototyped. [35]
They define how information sent/received through the connection are encoded (as in Content-Encoding), the session verification and identification of the client (as in browser cookies, IP address, user-agent) or their anonymity thereof (VPN or proxy masking, user-agent spoofing), how the server should handle data (as in Do-Not-Track or Global ...
Some web applications need to manage user sessions, so they implement states, or server side sessions, using for instance HTTP cookies [46] or hidden variables within web forms. To start an application user session, an interactive authentication via web application login must be performed. To stop a user session a logout operation must be ...
In multiparty session types interactions between all participants are described using a global type, which is then projected into local types that describe communication from the local view of each participant. Importantly, the global type encodes the sequencing information of the communication, which would be lost if we were to use binary ...
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In computer science and networking in particular, a session is a time-delimited two-way link, a practical (relatively high) layer in the TCP/IP protocol enabling interactive expression and information exchange between two or more communication devices or ends – be they computers, automated systems, or live active users (see login session).