Description:
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I have variable with type "double" with value 16.90 or 17.90 or 18.90 or 19.90. 
Now multiply variable x 100 and now set type of variable to "integer" with 
function "settype" and print this variable. Result will for example: 1989, even 
that correct result is 1990. This make only, when original value is 16.90 or 17.90 
or 18.90 or 19.90. If is original value another (for example 10.90 or 19.80), 
result will 
be correct (for example 1090 or 1980), but now is result incorrect for example 
1989.

Test script:
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<?php
$double = 19.90; // Only 16.90 or 17.90 or 18.90 or 19.90 will print bad result
$integer = $double*100; // Now is value 1990
settype($integer, 'integer'); // This change value to 1989 - bug
echo $integer;

Expected result:
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Value of "integer" - 1990

Actual result:
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Value of "integer" - 1989