How do I extend an interface?

What should you do to prevent error while unserializing serialized object of non-existent class?

When an object is serialized, which method will be called, automatically, providing your object with an opportunity to close any resources or otherwise prepare to be serialized?

Can we use mysqli commands to connect to the database ?

What is the keyword to define a class ?

Consider the following code: $a=$b=7; You want to test whether variables $a and $b are equal and of the same type, which of the following is correct ?

Output of the code? $var = 10; function fn() { $var = 20; return $var; } fn(); echo $var;

Which is an iterator class included in Standard PHP Library (SPL) in PHP5?

Which is not a file related function in PHP?

Which variable declaration within a class is invalid in PHP5?

Which printing construct/function accept(s) multiple parameters?