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vbarbarosh/php_math_float_error.php

Last active June 9, 2019 17:32
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php_math_float_error – Rounding errors in PHP https://codescreens.com
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php_math_float_error.php
<?php
# Rounding errors in PHP
# docker run --rm -i php:5.6 php < php_math_float_error.php
# docker run --rm -i php:7.1 php < php_math_float_error.php
# docker run --rm -i php:7.2 php < php_math_float_error.php
# docker run --rm -i php:7.3 php < php_math_float_error.php
define('FLOAT_ERROR', 0.00001);
$a = 4.99998;
$b = 4.99999;
var_dump(($b - $a) <= FLOAT_ERROR);
# false
var_dump(($b*1E6 - $a*1E6) <= FLOAT_ERROR*1E6);
# true
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