Get absolute value in PHP
Get absolute value of argument.
Use abs() for both of integer and float.

get_absolute_value.php 
<?php
// Get absolute value of integer
echo "Absolute value of  5 is ".abs(5)."\n";
echo "Absolute value of -5 is ".abs(-5)."\n";

// Get absolute value of float
echo "Absolute value of  5.5 is ".abs(5.5)."\n";
echo "Absolute value of -5.5 is ".abs(-5.5)."\n";
?>
Result 
$ php get_absolute_value.php
Absolute value of  5 is 5
Absolute value of -5 is 5
Absolute value of  5.5 is 5.5
Absolute value of -5.5 is 5.5