如何在PHP中获得浮点数的二进制表示？ [英] How to get binary representation of floating-point number in PHP?

问题描述

有什么办法在PHP中获得浮点数的二进制表示？像Java的 Double.doubleToRawLongBits（）给定一个正的浮点数，我想得到最大的可表示的浮点数小于这个数。在Java中，我可以这样做：

  double x = Double.longBitsToDouble（Double.doubleToRawLongBits（d） -  1） ; 
  

但是我在PHP中没有看到类似的东西。

pack（）

Is there any way to get the binary representation of a floating point number in PHP? Something like Java's Double.doubleToRawLongBits().

Given a positive floating point number, I'd like to get the largest representable floating-point number which is less than that number. In Java, I can do it like this:

double x = Double.longBitsToDouble(Double.doubleToRawLongBits(d) - 1);

But I'm not seeing anything similar in PHP.

解决方案

This isn't a full answer, but the only way I know of to put a float into binary is with pack()

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