Why functions are being used in PHP?

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Why functions are being used in PHP?

Functions are an essential part of PHP programming.PHP function is a piece of code that can be reused many times. It can take input as argument list and return value. Functions can be reused multiple times in a program, reducing the time and effort of repeating a single code.PHP provides us with two major types of functions:

Built-in functions : PHP provides us with huge collection of built-in library functions. These functions are already coded and stored in form of functions. To use those we just need to call them as per our requirement like, var_dump, strlen(), print(), date()and so on.

User Defined Functions : Apart from the built-in functions, PHP allows us to create our own customised functions called the user-defined functions.
Using this we can create our own packages of code and use it wherever necessary by simply calling it.

Create a User Defined Function in PHP

A user-defined function declaration starts with the word function:
Syntax
function functionName() {
code to be executed;
}
A function name must start with a letter or an underscore. Function names are NOT case-sensitive.
PHP Functions Example-:

				
					<?php  
function sayHello(){  
echo "Hello PHP Function";  
}  
sayHello();   // call the function
?>  

				
			
				
					Output :
Hello PHP Function

Function Parameters or Arguments

We can pass the information in PHP function through arguments.An argument is just like a variable.
Arguments are specified after the function name, inside the parentheses. You can add as many arguments as you want, just separate them with a comma.
Let’s see the example to pass two argument in PHP function.

				
					<?php  
function myFunction($name,$age){  
echo "Hello $name, you are $age years old<br/>";  
}  
myFunction("Vishal",27);  
myFunction("Sarika",26);  
?> 

				
			
				
					Output:
Hello Vishal, you are 27 years old
Hello Sarika, you are 26 years old

PHP Function: Returning Value

To let a function return a value, use the return statement:
Let’s see an example of PHP function that returns value.

				
					<?php  
function Square($n){  
return $n*$n;  
}  
echo "Square of 25 is: ".Square(25);  
?> 

				
			
				
					Output:
Square of 25 is: 625

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