What is a Function?

What is a Function?

How To Define a User Function?

How To Invoke a User Function?

How To Return a Value Back to the Function Caller?

How To Pass an Argument to a Function?

How Variables Are Passed Through Arguments?

How To Pass Variables By References?

Can You Define an Argument as a Reference Type?

Can You Pass an Array into a Function?

How Arrays Are Passed Through Arguments?

How To Pass Arrays By References?

Can You Define an Array Argument as a Reference Type?

How To Return an Array from a Function?

What Is the Scope of a Variable Defined in a Function?

What Is the Scope of a Variable Defined outside a Function?

How To Access a Global Variable inside a Function?

How Values Are Returned from Functions?

How To Return a Reference from a Function?

How To Specify Argument Default Values?

How To Define a Function with Any Number of Arguments?

How is it possible to return a value from a function?

What is the function func_num_args() used for?

Explain about Functions in PHP?