How does php turn a positive number into a negative number

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This article operating environment: windows7 system, PHP7.1 version, DELL G3 computer

How does php turn a positive number into a negative number?

An example of a positive to negative code is as follows

$number = 99% echo number * =-1 × echo $number; / / output-99

Attached:

A negative number becomes a positive number.

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

The abs () function returns the absolute value of a number.

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