How to convert positive number to negative number in php

php method to convert a positive number to a negative number: 1. Create a PHP sample file; 2. Define a positive number variable; 3. Convert a positive number to a negative number through "$number *= -1;" That’s it.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

How to convert positive numbers in php Convert to negative number?

The code example of converting a positive number to a negative number is as follows;

$number = 99;
$number *= -1;
echo $number;   //输出 -99

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Convert a negative number to a positive number

$number = -11;
$result = abs($number);
echo $result;   //输出 11

abs() function returns a number Absolute value.

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