Description:
------------
The exact PHP version is PHP 5.5.3-1ubuntu2.3 (I was unable to find this in the version list).

Here is an example of the issue:

if (((float)8568.2 + (float)-614) == (float)7954.2) {
    echo 'Match';
}
else {
    echo 'No Match';
}

The result of this comparison is always false, resulting in "No Match".

The expected result is true or "Match" as 8568.2 + -614 = 7954.2

Example run via PHP HTTP Server.

PHP Modules:

[PHP Modules]
bcmath
bz2
calendar
Core
ctype
curl
date
dba
dom
ereg
exif
fileinfo
filter
ftp
gettext
hash
iconv
intl
json
libxml
mbstring
mhash
mongo
mysql
mysqli
openssl
pcntl
pcre
PDO
pdo_mysql
Phar
posix
readline
Reflection
session
shmop
SimpleXML
soap
sockets
SPL
standard
sysvmsg
sysvsem
sysvshm
tokenizer
wddx
xml
xmlreader
xmlwriter
Zend OPcache
zip
zlib

[Zend Modules]
Zend OPcache




Test script:
---------------
if (((float)8568.2 + (float)-614) == (float)7954.2) {
    echo 'Match';
}
else {
    echo 'No Match';
}


Expected result:
----------------
echo 'Match';

Actual result:
--------------
echo 'No Match';