In your PHP application you need to open a file. You want the application to issue a warning and continue execution, in case the file is not found. The ideal function to be used is:

Which is used to maintain the value of a variable over different pages?

The value of a local variable of a function has to be retained over multiple calls to that function. How should that variable be declared?

Result of the following expression: 6+4 * 9-3

Which is not true with regard to abstract classes in php5?

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

How to define an abstract class?

How to define an interface?

What happen when you use mysql_connect in php 5.5 ?

What does password_verify function ?

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 ?