Description:
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SYSTEM
I test here by PHP 7.2.4 as well: http://sandbox.onlinephpfunctions.com/
and on my desktop 7.1.25 (this come from the php is downloaded and installed from here: https://www.apachefriends.org/download.html)

PROBLEM
The same values in case of some operators do not result the right outcomes. All of the six cases need to be true but first four return false values.

Test script:
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$a = '0.9';
$b = '7.34';
$c = '100';
$d = floor(($a * $b)*100)/100;
$e = $c + $b - $d;//this return 100.74 too
$f = 100.74;

// values of variables
var_dump($e);
var_dump($f);

//first four return false values but all of them need to be true
var_dump($e == $f);//false
var_dump($e <= $f);//false
var_dump($f >= $e);//false
var_dump($e == $f);//false
var_dump($e >= $f);//true
var_dump($f <= $e);//true

Expected result:
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All the equations need to return true value for the same numbers.