isset — Determine whether a variable is set or not! Returns TRUE if var exists; FALSE otherwise. If a variable has been unset with unset(), it will no longer be set. isset() will return FALSE if testing a variable that has been set to NULL. isset() only works with variables as passing anything else will […]

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PHP – Sessions

by Hiroshi on June 23, 2008

in isset, Sessions

Session support in PHP consists of a way to preserve certain data across subsequent accesses. This enables you to build more customized applications and increase the appeal of your web site. A visitor accessing your web site is assigned a unique id, the session id. This is either stored in a cookie on the user […]