How to force conversion of negative numbers to positive numbers in php

3 ways to force a negative number to be converted into a positive number: 1. Use the inversion operation "-" and the syntax "-$number"; 2. Use the "*" or "*=" operator to convert the original number to a positive number. Multiply the number by "-1", the syntax is "$number*(-1)" or "$number *= -1;"; 3. Use the abs() function to get the absolute value of the original number, the syntax is "abs($number) ".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php forces negative numbers to Method of converting to a positive number

Method 1: Use the negation operation

The negation operator is a unary operator, also called unary subtraction operator.

<?php
header("Content-type:text/html;charset=utf-8");
$number = -11;
echo "原负数：".$number."<br>";
$result = -$number;
echo "转为正数后：".$result;
?>

Method 2: Use the "*" or "*=" operator to multiply the original number by "-1"

<?php
header("Content-type:text/html;charset=utf-8");
$number = -12;
echo "原负数：".$number."<br>";

$result = $number*(-1);
echo "转为正数后：".$result."<br>";

$number *= -1;
echo "转为正数后：".$number;
?>

Method 3: Use the abs() function to get the absolute value

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

<?php
header("Content-type:text/html;charset=utf-8");
$number = -13;
echo "原负数：".$number."<br>";

$result = abs($number);
echo "转为正数后：".$result."<br>";
?>

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