PHP expression output -

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this question has answer here:

i found somewhere in book 

echo (int) ((0.1 + 0.7) * 10);

output : 7

echo ((0.1 + 0.7) * 10);

output : 8

why both out different ? think answer should 8

when write 

echo ((0.1 + 0.7) * 10);

the result of simple arithmetic expression stored internally 7.999999 instead of 8.

now when value converted int, 

 echo (int) ((0.1 + 0.7) * 10); // 7.999999 when typecasted int becomes 7

php truncates away fractional part, resulting in rather significant error (12.5%, exact).


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