<?php
$x=20;
$y=60;
$z=100;
function sum_sales(){
	global $x,$y,$z;
	return $x + $y + $z;
}
echo sum_sales();
echo '<hr>';
//-----------------------------
$username='vahid';
$email='va@gmail.com';
$password='123';
function add_user(string $username,string $email,string $password):string{
	return $username.$email.$password;
}
echo add_user($username,$email,$password);
echo '<hr>';
//-----------------------------
function setwidth(int $width = 5):int {
	return $width;
}
echo setwidth();
//echo setwidth(width:100);