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result PHP : 3.3306690738755E-15
if you go to do the sum is 0, but php returns 3.3306690738755E-15. Why?
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Floating point values have a limited precision. Hence a value might
not have the same string representation after any processing. That also
includes writing a floating point value in your script and directly
printing it without any mathematical operations.
If you would like to know more about "floats" and what IEEE
754 is, read this:
Thank you for your interest in PHP.