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Floating point error in representation?
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Doing calculations in MySQL vs PHP
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Confusion with floating point numbers
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Working with large numbers in PHP
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Floating point arithmetic not producing exact results
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PHP bitwise left shifting 32 spaces problem and bad results with large numbers arithmetic operations
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How do I format a number to a dollar amount in PHP
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Division in script and floating-point
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undefined offset PHP error
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How to manually parse a floating point number from a string
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How do I parse a string with a decimal point to a double?