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sign - Sign of a number
float sign( float $x )
sign() returns 1.0 if $x > 0, 0.0 if $x = 0, or –1.0 if $x < 0.
x - The number to process. It can be a scalar or an array.
-1, 0, or 1 depending on whether x is negative, zero, or positive. If x is an array, the return value will also be an array.
1.0 and above.