PHP Subtraction (-)

In this tutorial, you shall learn about Arithmetic Subtraction Operator in PHP, its syntax, and how to use this operator in PHP programs, with examples.

PHP Subtraction

PHP Arithmetic Subtraction Operator takes two numbers as operands and returns the difference of second operand from first operand.

Symbol

- symbol is used for Subtraction Operator.

Syntax

The syntax for subtraction operator is

operand_1 - operand_2

The operands could be of any numeric datatype, integer or float.

If the two operands are of different datatypes, implicit datatype promotion takes place and value of lower datatype is promoted to higher datatype.

Examples

1. Subtraction of Integers

In the following example, we take integer values in $x and $y, and find $x - $y using Arithmetic Subtraction Operator.

PHP Program

<?php
  $x = 5;
  $y = 4;

  $output = $x - $y;

  echo "x = $x" . "<br>";
  echo "y = $y" . "<br>";
  echo "x - y = $output";
?>

Output