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Functions in PHP

Just like we have learned in mathematics, the basic way to think of and understand functions is to think of it as a machine, you feed it with raw materials and the machine goes through processing these materials into finished and possibly usable product. An easy way to look at functions is to consider the way we use baking ovens in households, to make bread you would mix all the ingredients and stick the uncooked dow in the oven. After a while you pop the oven and there is you bread, well baked and tasty.

Functions in PHP

In PHP and other programming languages that use functions, a function is considered to be a self-contained or autonomous block of code that can be called by other programs or scripts to perform a certain task. When called the function executes the code enclosed in its parenthesis and may or may not return a value to the calling code.

Built-in functions

Built-in functions are part of the development language. These are aimed at easing the development process by shielding the developer from complex programming aimed at producing certain results. An example of this are the print(), echo (), addSlashes () and many others, these functions themselves have complex programming involved. Instead of letting every developer suffer through the pain of developing their own code to perform these functions. The language infrastructure allow developers to simply call the function name and pass it the values.

User defined functions

User defined functions are those created by the developer. The whole purpose of using functions in programming is the ability to reuse the code. Without using functions, the developer will have to duplicate code whenever needed. If there is a piece of code that is frequently used, you may consider putting it in a function, that way all you have to do when you need the same functionality is simply call the function. The general format for defining a function is as follows:

function function_name($argument1, argument2,…){

    //put the function code here

}

Practical example of how to use functions

first we are going to define a function and the I will show you how that function can be called to perform a certain task:
function definition:

function add_numbers($number1,$number2){

             $sum = $number1 + $number2;

              return $sum;

     }

To call this function you could do the following:

 echo add_numbers(3,5);

This will call the function add_numbers, that function adds the two numbers together and return the sum. This statement here then prints the returned value.

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Functions in PHP

Functions in PHP

Built-in functions

User defined functions

Practical example of how to use functions

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