functions and superglobals in php

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 Functions:

a function is a block of code that is made up of a set of statements that can be used when it is called.

a function will be executed when it is called.


function keyword is used to create a keyword.

key points for a function in php:

  1. a function name always starts with letters
  2. a function name must be without any spaces
  3. functions are not case sensitive
  4. arguments: values passed when a function is called.
  5. parameters: the variables that are defined when the function is declared.

syntax:

function function_name(arguments if any)

{

#statements

}

example:

<?php
function show()
{
echo"show function is called";
}
show();
?>


aspects to create a function:
  1. without argument without return
  2. without argument with a return
  3. with argument without return
  4. with an argument with a return


function without argument without return

<?php
function show()
{
echo"show function is called";
}
show();
?>



function with argument without return

<?php
function sum($a,$b)
{
echo $a+$b;
}
sum(8,5);
?>

function with an argument with a return

<?php
function sum($a,$b)
{
return $a+$b;
}
echo sum(8,5);
?>

function without argument with a return

<?php

function sum()
{
return 3+3;
}

echo sum();
?>



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