Description:
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The magic number is: 0.2 or -0.2

number - number = 0.2 or -0.2

then int conversion return bad result.

I tried with (int) or intval. Same result.

We tried with Win7, Win10 and Ubuntu 16.04


ubuntu's php version (official, installed with ap-get):
PHP 7.0.8-0ubuntu0.16.04.2 (cli) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.8-0ubuntu0.16.04.2, Copyright (c) 1999-2016, by Zend Technologies


Test script:
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<?php

echo "<pre>";

$var = (1-1.2)*100;
var_dump($var); //float(-20)

$var2 = (-0.2)*100;
var_dump($var2); //float(-20)

$var_int = (int)$var;
var_dump($var_int); //int(-19) ** INCORRECT RESULT **

$var2_int = (int)$var2;
var_dump($var2_int); //int(-20)

echo "</pre>";





//I changed values and no problem

echo "<pre>";

$var = (2-1.2)*100;
var_dump($var); //float(80)

$var2 = (0.8)*100;
var_dump($var2); //float(80)

$var_int = (int)$var;
var_dump($var_int); //int(80)

$var2_int = (int)$var2;
var_dump($var2_int); //int(80)

echo "</pre>";