How long does a session last in php?
Why does sql injection happen?
What is url encoding and decoding in php?
What is the use of magic function in php?
What is the use of print_r function in php?
What is the use of offset in mysql?
What is the maximum size of a database in mysql?
What is the difference between require_once and require in php?
What is the maximum size of a table in mysql?
What is urlencode and urldecode in php?
What is the difference between null and empty?
What is the use of inner join in mysql?
Why triggers are used in mysql?
Why print_r is used in php?
What is a stored procedure in mysql?