How do you check if a variable has not been set in php?


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More PHP Interview Questions

What is isset php?

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Can php run without apache?

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Version of php, apache ,mysql

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How does header() work . What do they tell the server same question for SESSIONS

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1.What are the difference between echo , print , print_r ? else this 3 can we show output to a client in some other way?

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What is local variable in php?

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How can we destroy the cookie in php?

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How to redirect a url from http to https in .htaccess?

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What are the final class and final method?

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How can I use the COM components in php?

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Is it possible to destroy a cookie?

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What are the encryption functions in php?

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