What is preg_match?
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What is php and sql used for?
What are magic constants in php?
What is a static variable in php?
How will you calculate days between two dates in PHP?
What are the uses of implode() function?
What the limitation of header() function in php?
How can we optimize or increase the speed of a mysql select query?
Explain the importance of the function htmlentities.
What is if isset ($_ post submit )) in php?
Which is correct about mysqli and pdo?
How do sessions work in php?
1.Where are the sessions storing ? 2.What are the contents of a session file ? 3.If the server is loaded with too many session files there is a possibility of server crash. How can we solve this issue? 4. How does php server identify that the particular session belongs to particular user ? For ex: If two users A and B logged from different machine, separate session files (say 1 and 2) will be created in the server. But how the php knows that 1 belongs to A and 2 belongs to B ?