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# hypot

(PHP 4 >= 4.1.0, PHP 5)

hypotCalculate the length of the hypotenuse of a right-angle triangle

### Описание

float hypot ( float \$x , float \$y )

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).

### Список параметров

x

Length of first side

y

Length of second side

### Возвращаемые значения

Calculated length of the hypotenuse

User Contributed Notes
hypot
</Life>.org
10-Aug-2006 09:56
```to robinv at ecosse dot net: hypo(a, b, c) === hypo(a, hypo(b, c)) hypo(a, b, c, d) === hypo(a, hypo(b, hypo(c, d))) ...```
R. Victor Klassen
24-Jun-2005 03:03
`A correct implementation of hypot( x, y ) avoids the overflow that might otherwise happen if either x or y is large enough that when squared it would overflow, but the answer is small enough not to cause overflow.`
robinv at ecosse dot net
07-Jan-2004 05:18
```A simpler approach would be to allow an arbitrary number of parameters. That would allow for whatever number of dimensions you want *and* it would be backwards compatible with the current implementation. <?php function hypo() {     \$sum = 0;     foreach (func_get_args() as \$dimension) {         if (!is_numeric(\$dimension)) return -1;         \$sum += pow(\$dimension, 2);     }     return sqrt(\$sum); } print hypo();          // vector in 0 dimensions, magnitude = 0. print hypo(1);         // vector in 1 dimension,  magnitude = 1. print hypo(3, 4);       // vector in 2 dimensions, magnitude = 5. print hypo(2, 3, 6);     // vector in 3 dimensions, magnitude = 7. ?>```