Php If Isset Session

The PHP session variable is used to store information about user sessions, or to change settings for user sessions. The session variable holds information that is single user and is available to all pages in the application. PHP Session variable When you run an application, you open it, make some changes, and then close it. It's like a conversation. The computer knows who you are. It knows when you start the application and when it terminates. But on the internet, there is a problem: the server does not know who you are and what you do, this is due to H ...

Let PHP session never expire, you may not have encountered such a depressing problem, but I encountered, very depressed. We developed a system that only corporate customer service staff can use - a limited number of customer service staff. This is a limited number of customer service staff a few days ago suddenly raised such a problem: We every very short period of time (half an hour does not operate the page), are anxious to solve customer problems, the system has prompted the need to log in, delayed The customer's time ... This is unhappy! The customer is God, the only God. So on the peak requirements we can really ...

Fourteen make PHP beginners a big headache Summary Today for everyone to give PHP beginners a headache big summary, the following 14 questions hope for PHP beginners to help. 1, the page can not be passed variables get, post, session Automatic global variables in the latest php version is turned off, so to get over the variables from the previous page to use $ _GET ['foo'], $ _ POST [ 'foo'], $ _ SESSION ['foo']. Of course it can be ...

Several important php.ini options Register Globals php> = 4.2.0, the default value for php.ini's register_globals option is set to Off, and when register_globals is set to On, the program can receive various environment variables from the server , Including the form submitted variables, but also because PHP does not have to initialize the value of the variable, resulting in a big security risk. Example 1: // check_admin () with ...

This is a section using PHP and mysql database tutorials to achieve user registration and login code Oh, the function is relatively simple and practical user registration procedures Oh. At the same time also added when the user login verification code program, this is a lot of safety Oh. * /?> <! doctype html public "- // w3c // dtd xhtml 1.0 transitional // en" "ht ...