Published by: Sujan
Published date: 16 Jun 2021
There are two types of PHP Functions they are:
A function is a self-contained block of code that performs a specific task.
It has a huge collection of internal or built-in functions that you can call directly within your scripts to perform a specific task,
like gettype(), print_r(), var_dump, etc.
In addition to the built-in functions, it also allows you to define your own functions. It is a way to create reusable code packages that perform specific tasks and can be kept and maintained separately from the main program.
The basic syntax of creating a custom function can be given with:
function functionName(){
// Code to be executed
}
{PHOTO}
You can specify parameters when you define your function to accept input values at run time. The parameters work like placeholder variables within a function; they're replaced at run time by the values (known as argument) provided to the function at the time of invocation.
function myFunc($oneParameter, $anotherParameter){
// Code to be executed
}
You can define as many parameters as you like. However, for each parameter, you specify, a corresponding argument needs to be passed to the function when it is called.
The getSum() function in the following example takes two integer values as arguments, simply add them together and then display the result in the browser.
{PHOTO}
You can also create functions with optional parameters — just insert the parameter name, followed by an equals (=) sign, followed by a default value, like this.
{PHOTO}
A function can return a value back to the script that called the function using the return statement. The value may be of any type, including arrays and objects.
{PHOTO}