What is a collection of characters that is treated as one entity called?

A fatal run-time error would be caught by

Which function checks for the existence of a particular key?

What function helps prevent MySQL injection?

Which one sorts an array and maintains index association?

How do I typecast a variable to boolean?

Why does this code trigger an error?

What is the job of the controller as a component in MVC?

What is the value of $result in this calculation? $result = 25 % 6;

You want to list the modules available in your PHP installation. What command should you run?

The php not operator is !. Given the snippet, is there an out put and what is it?