php unpack n

The unpack function in PHP is used to unpack binary data into named array elements or variables. It takes two arguments: the format string and the data string.

The format string specifies the format of the binary data and how it should be unpacked. It consists of one or more format codes, each representing a specific data type. Some commonly used format codes include:

• n: Unsigned short (always 16 bit, big endian byte order)

To unpack a single unsigned short from a data string, you can use the following code:

$data = "\x00\x01"; // Example data string containing an unsigned short (0x0001)
$result = unpack("n", $data);
echo $result[1]; // Output: 1

In this example, the format string is "n", which specifies that an unsigned short should be unpacked. The unpack function returns an associative array where the key is the index of the unpacked value (in this case, 1) and the value is the unpacked data.