hypot()

(PHP 4 >= 4.1.0, PHP 5, PHP 7)

计算一直角三角形的斜边长度

说明

hypot()函数将会跟据直角三角形的两直解边长度$x和$y计算其斜边的长度。或者是从标点($x,$y)到原点的距离。该函数的算法等同于sqrt(x*x + y*y)。

参数

第一条边的长度

第二条边的长度

返回值

计算斜边的长度

If you need a higher-dimensional diagonal length (norm), you can exploit the fact that sqrt(x*x+y*y+z*z) == sqrt(x*x+sqrt(y*y+z*z)). In other words hypot(x, y, z)==hypot(x, hypot(y, z)).
To be generic about it....

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.