整形轉化成 2二進位制 可以用 base_convert:

$str = 0x8000;

echo $str2 = base_convert($str, 16, 2);

echo "<br>";

echo base_convert($str2, 2, 16);

[code]

字串 檔案等 可以考慮用 pack 和 unpack 轉化成二進位制

[code=PHP]

$file1 = "F:/46.gif"; //隨便拷一個圖片作為測試用

$file2 = "F:/test.txt"; //生成的二進位制流儲存在這個檔案裡

$file3 = "F:/47.gif"; //由二進位制流還原成的檔案

$size = filesize($file1);

echo "檔案大小為：".$size;

echo "\n<br>轉化為二進位制 ...";

$content = file_get_contents($file1);

$content = bstr2bin($content);

$fp = fopen($file2, "w");

fwrite($fp, $content);

fclose($fp);

$size2 = filesize($file2);

echo "轉化成二進位制後文件大小為：".$size2;

$content = bin2bstr($content);

$fp = fopen($file3, "w");

fwrite($fp, $content);

fclose($fp);

function bin2bstr($input)

// Convert a binary expression (e.g., "100111") into a binary-string

{

if (!is_string($input)) return null; // Sanity check

// Pack into a string

$input = str_split($input, 4);

$str = "";

foreach ($input as $v)

{

$str .= base_convert($v, 2, 16);

}

$str = pack("H*", $str);

return $str;

}

function bstr2bin($input)

// Binary representation of a binary-string

{

if (!is_string($input)) return null; // Sanity check

// Unpack as a hexadecimal string

$value = unpack("H*", $input);

// Output binary representation

$value = str_split($value[1], 1);

$bin = "";

foreach ($value as $v)

{

$b = str_pad(base_convert($v, 16, 2), 4, "0", STR_PAD_LEFT);

$bin .= $b;

}

return $bin;

}