php validate negative number code example

Example 1: php if negative make positive

<?php
echo(abs(6.7) . "<br>");
echo(abs(-6.7) . "<br>");
echo(abs(-3) . "<br>");
echo(abs(3));
?>

Example 2: check number is positive or negative in php

if($number > 0){
  echo "the number is positive";
}
elseif($number < 0){
  echo "the number is negative";
}
else{
  echo "the number is zero";
}