Description:
------------
When converting to float from string, its always use "." as a decimal separator, but echo shows decimal separator using locale definition.
Because of that there's a problem eg. in dbase function on numeric(float) fields.

Reproduce code:
---------------
setlocale(LC_ALL,"pl_PL");
echo '1.2*1=';
echo "1.2"*1;
//produce 1.2*1=1,2
echo '1,2*1=';
echo "1,2"*1;
//produce 1,2*1=1 <- this was expected to produce 1,2 float on pl_PL (in PL decimal separator is ",")

setlocale(LC_ALL,"en_EN");
echo '1.2*1=';
echo "1.2"*1;
//produce 1.2*1=1.2
echo '1,2*1=';
echo "1,2"*1;
//produce 1,2*1=1 <- correct on en_EN

//the most ugly examlpe
setlocale(LC_ALL,"pl_PL");
echo (("1.2"*1)."")*1; //produce 1 
echo (("1,2"*1)."")*1; //also produce 1 


Expected result:
----------------
on pl_PL
1
1,2

on en_EN
1.2
1

last one example code:
1
1,2

Actual result:
--------------
on pl_PL
1,2
1

on en_EN
1.2
1

last one example code:
1
1