It knows when you start the application and when you end.
Session variables solve this problem by storing user information to be used across multiple pages (e.g. By default, session variables last until the user closes the browser.
In this page, we start a new PHP session and set some session variables: Next, we create another page called "demo_session2.php".
From this page, we will access the session information we set on the first page ("demo_session1.php").
Its goal is to enable generic SGML to be served, received, and processed on the Web in the way that is now possible with HTML.
XML has been designed for ease of implementation and for interoperability with both SGML and HTML.
6.1.1 Using DOM parses a XML file and prints it on the console . This is a two stage process, first it parses the XML file and creates a tree structure in the memory.CSS Reference Bootstrap Reference Icon Reference × PHP HOME PHP Intro PHP Install PHP Syntax PHP Variables PHP Echo / Print PHP Data Types PHP Strings PHP Constants PHP Operators PHP If... Elseif PHP Switch PHP While Loops PHP For Loops PHP Functions PHP Arrays PHP Sorting Arrays PHP Superglobals PHP Form Handling PHP Form Validation PHP Form Required PHP Form URL/E-mail PHP Form Complete PHP Arrays Multi PHP Date and Time PHP Include PHP File Handling PHP File Open/Read PHP File Create/Write PHP File Upload PHP Cookies PHP Sessions PHP Filters PHP Filters Advanced PHP Error Handling PHP Exception My SQL Database My SQL Connect My SQL Create DB My SQL Create Table My SQL Insert Data My SQL Get Last ID My SQL Insert Multiple My SQL Prepared My SQL Select Data My SQL Delete Data My SQL Update Data My SQL Limit Data PHP XML Parsers PHP Simple XML Parser PHP Simple XML - Get PHP XML Expat PHP XML DOM AJAX Intro AJAX PHP AJAX Database AJAX XML AJAX Live Search AJAX RSS Reader AJAX Poll PHP Examples PHP Quiz PHP Certificate PHP Array PHP Calendar PHP Date PHP Directory PHP Error PHP Filesystem PHP Filter PHP FTP PHP HTTP PHP Libxml PHP Mail PHP Math PHP Misc PHP My SQLi PHP Simple XML PHP String PHP XML PHP Zip PHP Timezones PHP filters are used to validate and sanitize external input.The PHP filter extension has many of the functions needed for checking user input, and is designed to make data validation easier and quicker.It is a product of the XML Core Working Group as part of the XML Activity. As a convenience to readers, it incorporates the changes dictated by the accumulated errata (available at to the Fourth Edition of XML 1.0, dated 16 August 2006.The English version of this specification is the only normative version. In particular, erratum [E09] relaxes the restrictions on element and attribute names, thereby providing in XML 1.0 the major end user benefit currently achievable only by using XML 1.1.