php functions

function is a block of statements to use repeatedly
function functionname(arguments)
function functionname()
<?php
echo 'myname is';
function myfunction(){
echo 'rafigue';
}
myfunction();	without writing too many statemenst, by callingthat  function we can implement this
myfunction();
myfunction();
?>
function with arguments
<?php
function add($num1, $num2){
echo $num1 + $num2;
}
add(1,2);
add(5,6);
?>
function with arguments
<?php
function add($num1, $num2){
echo $num1 + $num2;
}
$x= 100;
$y = 400;
add($x, $y);
?>
<?php
function printDate ($day, $month, $year){
echo $day.' '.$month.' '.$year;
}
$d = 5;
$m = 'jan';
$y = 2018;
printdate($d, $m, $y);
?>
//(10+10)/(5+1) =20/10
function add($num1, $num2){
$result= $num1 + $num2;
return $result;
}
function divide ($num1, $num2){
$result = $num1/$num2;
return $result;
}
echo ' divide(add(1,2), add(2,3))'; or
$finalresult=  echo ' divide(add(1,2), add(2,3))';
echo 'final result';
global, local and static variable
global	variable declared outside the function
$x = 280;
function myfuntion(){
echo $x;	we cant use that variable inside the function
}
myfunction();
$x = 280;
function myfuntion(){
global $x;	we can use global variable
echo $x;
}
myfunction();
local variable	a variable we can use inside the function and it will declared inside
function fun1(){
$x = 100;
}
fun1();	undefined , because we cant print the local variable which is used inside the function
echo $x;
using return we can get the only value
function fun1(){
$x = 100;
return $x;
}
echo fun1();	print tha t value only
or
$y = 250;	another programm
$x = $y+ fun1();
echo $z;
function mytext(){
$x = 0;	assigned variable and after printed , value incrimetned
echo $x .'<br/>'	it prints 0, incriments
$x++;	but incrimetned value will not print becaues it after execution of function the value will deleted
}
mytext();	0
mytext();	0
mytext();	0
to show incrimented value we have to use
static
function mytext(){
static $x = 0;
echo $x .'<br/>'
$x++;
}
mytext();	0
mytext();	1
mytext();	2

function

global variable

global

local]

return

static variables

what is meant by function

what is meant by function with arguments

what is meant by function without arguments

how function is called

function for adding two numbers

function for adding divide two numbers

how to add numbers

how to print date

how to add numbers

how to divide the two numbers

we cant use that variable which is declared the outside

to use the variable which is declared outside of the function , use global

declared variable

we cant access the variable which is declared inside the function

if we want to access we have to use return method

print the value

print the value by ading another value

for every function executes , the value will  be 0, to store that value

to show incrimented values use sttic