php 如何在php中将整数转换为字节数组
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How to convert integer to byte array in php
提问by user1392060
how would I convert an integer to an array of 4 bytes?
如何将整数转换为 4 个字节的数组？
Here is the exact code I want to port (in C#)
这是我想要移植的确切代码（在 C# 中）
int i = 123456;
byte[] ar = BitConverter.GetBytes(i);
// ar will contain {64, 226, 1, 0}
How would I do the exact same thing in PHP ?
我将如何在 PHP 中做完全相同的事情？
回答by Jon
The equivalent conversion is
等效转换为
$i = 123456;
$ar = unpack("C*", pack("L", $i));
You should be aware though that the byte order (little/big endian) is dependent on the machine architecture (as it is also in the case of BitConverter). That might or might not be good.
您应该知道字节顺序（小/大端）取决于机器架构（在 的情况下也是如此BitConverter）。这可能好也可能不好。
回答by deceze
Since the equivalent of a byte array in PHP is a string, this'll do:
由于 PHP 中字节数组的等价物是一个字符串，因此可以执行以下操作：
$bytes = pack('L', 123456);
To visualize that, use bin2hex:
要可视化，请使用bin2hex：
echo bin2hex($bytes);
// 40e20100
// (meaning 64, 226, 1, 0)
回答by Jan Prieser
$i = 123456;
$byte_array = unpack('C*', $i);
var_dump($byte_array);
array(6) {
[1]=>
int(49)
[2]=>
int(50)
[3]=>
int(51)
[4]=>
int(52)
[5]=>
int(53)
[6]=>
int(54)
}
