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is_infinite

(PHP 4 >= 4.2.0, PHP 5)

is_infinite -- 判断是否为无限值

说明

bool is_infinite ( float val )

如果 val 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。

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Last updated: Thu Jul 7 19:13:47 2005 CST