定义和用法:is_infinite() 判断是否为无限值。
语法:is_infinite(x)
参数 描述
x 必需,规定要检查的值。
说明:如果 x 为无穷大（正的或负的),例如 log(0) 的结果或者任何超出本平台的浮点数范围的值,则返回 true,实例代码如下:
function is_w_x_z($number) //自定义函数扩展判断功能
{
if(is_infinite($number)) //对数值进行判断
{
echo $number."是无限值！"; //根据判断结果输出内容
}
else //如果判断结果非真
{
echo $number."是有限值！"; //输出相应内容
}
}
is_w_x_z(9999999999999999999999999999999999); //调用函数，返回1e+034是有限值！
echo "<br>";
is_w_x_z(log(0)); //调用函数，返回-1.#inf是无限值！
echo "<br>";
is_w_x_z(130); //调用函数，返回130是有限值！hypot() 函数计算一直角三角形的斜边长度.
语法:hypot(x,y)
参数 描述
x 必需,边 x 的长度.
y 必需,边 y 的长度.
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).
echo "直角三角形的直角边为3，4则斜边为："; echo "<br>"; echo hypot(3,4); //返回5 echo "<br>"; echo "直角三角形的直角边为5，13则斜边为："; echo "<br>"; echo hypot(5,12); //返回13
永久地址：
转载随意~请带上教程地址吧^^
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