PHP: Math Functions - Manual
www.php.net/manual/en/ref.math.php
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abs — Absolute value
ceil — Round fractions up
floor — Round fractions down
is_finite — Checks whether a float is finite
is_infinite — Checks whether a float is infinite
is_nan — Checks whether a float is NAN
max — Find highest value
min — Find lowest value
sqrt — Square root
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