add_sub.php

<?php

// +, - 

$number = 1.5;  // float
$y = 5; //interger

// 



print_r("\n");
print_r("<br>");

// echo "The output of sub values : ";
// print_r($y-$number);


// 
// $sum = $number + $y;
// print_r("<br>");
// print_r($sum);

// $number = $number + $y;
$number += $y;
$number -= $y;

print_r("Sum number is".$number);



?>