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**solved** floating numbers question

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What does this paragraph mean exactly in relation to php, why is this so, and what do I need to look out for, this was quoted from www.hudzilla.org.
"You should be aware that floating-point numbers are complicated beasts, and are unpredictable. The classic example is the sum "(0.1+0.7)*10" converted to an integer. You might think, "that's easy - it's 8", but PHP will report 7. The reason for this is because inherent inconsistencies in floating-point numbers mean that the value will actually be 7.9999999999999991. Usually this is not a problem, because rounding that value even to 10 decimal places gives you 8, however it does mean that you should avoid comparing floating-point numbers wherever possible"

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