PHP Language - Functions
How To Set A Default Value For An Argument Variable In A PHP Function 
In this tutorial, you will learn how to use a default value for an argument variable in a PHP function. This default value is used by the function only if there is no value for the argument variable passed to the function in the function call.
How To Write A PHP Function
Although the PHP language has many built-in functions, there will be times when you will want to write a customized function for your program. This is easily done with PHP. Let´s take a look at the code that will define or declare a PHP function.
The PHP Function and Function Call
There are basically two types of PHP functions. The first type is the built-in function. The second type of function is the user defined function. These are the functions that you write yourself. Then, you can call it into your program any time by coding a function call.
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