(PHP 4 >= 4.1.0, PHP 5, PHP 7)
hypot — Calculate the length of the hypotenuse of a right-angle triangle
hypot ( float $x , float $y ) : float
hypot() returns the length of the hypotenuse of a right-angle triangle with sides of length x and y, or the distance of the point (x, y) from the origin. This is equivalent to sqrt(x*x + y*y).
x
Length of first side
y
Length of second side
Calculated length of the hypotenuse
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https://www.php.net/manual/en/function.hypot.php