How to convert positive numbers to negative numbers in php

php method to convert a positive number into a negative number: 1. Define a positive number variable and assign it "$num=positive value;", use the multiplication operator "*" to combine the positive number with "-1" Just multiply, the syntax is "$num=$num* (-1)". 2. Define a positive number variable and assign it "$num=positive value;". Use the multiplication assignment operator "*=" to multiply the positive number and "-1". The syntax is "$num *= -1;" .

The operating environment of this tutorial: windows7 system, PHP8 version, DELL G3 computer

In PHP, you can use multiplication operations. Multiply by -1 to turn it into a negative number.

There are two ways to implement multiplication:

• Use the multiplication operator "*"

• Use the multiplication assignment operation Character "*="

Method 1. Use the multiplication operator "*"

Just use the multiplication operator "*" to convert Positive numbers and -1 can be multiplied.

$num*（-1）;

Example:

<?php
header("Content-type:text/html;charset=utf-8");
$number = 99;
echo "原正数：".$number."<br>";
$number = $number*（-1）;
echo "转换后的负数：".$number;   //输出 -99
?>

##Method 2: Use the multiplication assignment operator "*="

$num *= -1;

<?php
header("Content-type:text/html;charset=utf-8");
$number = 88;
echo "原正数：".$number."<br>";
$number *= -1;
echo "转换后的负数：".$number;   //输出 -88
?>

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