Description:
------------
$source=1370.72;
$local=1238.265;
$aa=($source - $local) / $source;
dump($aa);
$bb=  round($aa,4);
dump($bb);
dump(phpversion());

result:

float(0.09663169721022523)

float(0.09660000000000001)

string(6) "5.4.41"

Test script:
---------------
$source=1370.72;
$local=1238.265;
$aa=($source - $local) / $source;
dump($aa);
$bb=  round($aa,4);
dump($bb);
dump(phpversion());




Expected result:
----------------
float(0.09663169721022523)

float(0.0966)

string(6) "5.4.41"

Actual result:
--------------
float(0.09663169721022523)

float(0.09660000000000001)

string(6) "5.4.41"