What is isset and unset in php?


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If we login more than one browser windows at the same time with same user and after that we close one window, then is the session is exist to other windows or not? And if yes then why? If no then why?

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What is mean by an associative array?

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we have two tables first one is EMPLOYEE having EmpID, EmpNAME, Second table is SALARY table having id, salary Write a query to get name of those person who having more than 10000$ salary

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What is user defined function in php?

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