PHP：从二进制数据流中解压缩 32 位整数答案

【问题标题】：PHP: unpack 32 bit integers from binary stream of dataPHP：从二进制数据流中解压缩 32 位整数
【发布时间】：2017-12-29 02:47:44
【问题描述】：

我有一个 1024 位长的二进制数据流，我想将其转换为 32 位整数数组（即 32 个数字）。从这个question我使用了这个代码：

$filename = "myFile.sav"; 
$handle = fopen($filename, "rb"); 
$fsize = filesize($filename); 
$contents = fread($handle, $fsize); 
$byteArray = unpack("N*",$contents); 
print_r($byteArray);

即使将自身格式化为“N”，var_dump 也会打印出一个由 256 个 8 位长整数组成的数组。（我想要 32 个 32 位长的数字）。我究竟做错了什么？

编辑：它实际上不是 256 个 8 位数字，而是 256 个乱码

【问题讨论】：

标签： php binary

【解决方案1】：

您的文件似乎包含整数的二进制表示。给定任何string 位表示，bindec 函数会将它们正确转换为integer：

$content = "1000110010110110100100101011000100100000101011010101101110101101011101110011001110010010111101001011111000111000101110011110011100110110000111001110000011001101011100111011110000001110111100100110110001000111111001010101100011100101010111000011010101010010001101101100011001101110001001000101110111011001001101111000110101010001101010000101110000100010000110110111000110001110000010000111001100100111110011000101000110100011111100100011110100101010101101011011101100111000101011110111111010001110000011101001011101111010101010011010011010011101100011111111000110000110000000000101110110010100010011010001110101101100110110001011010010010000011000111101110000100100001101100010101011000110010110110111100111010010101110000101011101010010101110100111100111110011000100001010111110010001010100001010001011101101110010011001010000101011110101100001100001111011101010100001001101100100110001101000000110111000111001100001000110000011011100000100011100100110101101000101111011110001100110010001111111010101110111111010110010111001";

$parts = str_split($content, 32);

for ($i = 0; $i < count($parts); ++$i) {
    $parts[$i] = bindec($parts[$i]);
}

print_r($parts);

【讨论】：