Functions in php

A function is a block of statements that can be used repeated in an execution. If we declare a function in php, it will not execute the code inside the function untill it is called. The php has already thousands of built-in functions. Not only the built-in functions, we can also create our own functions called the user defined function.

Creating a user defined function

Like other languages, a user defined function starts with the keyword function.

Syntax:

function function_name(parameter)
{
//Code to be executed
}

eg:

<?php

function simple()

{

echo "hello world";

}

simple();

?>

output:

hello world

This is a simple program without any parameters passed to the function. We can use the parameters to pass values to the function.

eg:

<?php

function simple($arg)

{

echo "$arg world<br>";

}

simple("hello");

simple("nice");

?>

Output:

hello world
nice world

We can also pass more than one arguments to the function as belows:

eg:

<?php

function simple($arg1,$arg2)

{

echo "$arg1 $arg2";

}

simple("hello","world");

?>

Output:

hello world

The another keyword that is used inside a function is return. It is used to return a value from a function to outside the function. That is the returned value goes to the called function.

eg:

<?php

function simple(int $a,int $b)

{

return $a+$b;

}

echo add(2,3);

?>

Output:

5

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