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PHP is a general-purpose scripting language that is especially suited to server-side web development, in which case PHP generally runs on a web server. Any PHP code in a requested file is executed by the PHP runtime, usually to create dynamic web page content or dynamic images used on websites or elsewhere. [282]
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. User-defined functions can be created at any time and without being prototyped.
Some web applications need to manage user sessions, so they implement states, or server side sessions, using for instance HTTP cookies 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 requested ...
From an alternative name: This is a redirect from a title that is another name or identity such as an alter ego, a nickname, or a synonym of the target, or of a name associated with the target.
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Background HTTP cookies share their name with a popular baked treat. Origin of the name. The term cookie was coined by web-browser programmer Lou Montulli.It was derived from the term magic cookie, which is a packet of data a program receives and sends back unchanged, used by Unix programmers.
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Session hijacking. In computer science, session hijacking, sometimes also known as cookie hijacking, is the exploitation of a valid computer session —sometimes also called a session key —to gain unauthorized access to information or services in a computer system. In particular, it is used to refer to the theft of a magic cookie used to ...