[PHP]native method to convert an unsigned integer to a binary string (not textual binary string)

Question

Is there any native method that converts an unsigned integer to a binary string (either big-endian order or little-endian order is okay). The current way I come up with is:

$n = 0x12345678;
$s = "";
for ($i = 0; $i < 4; $i++)
{
    //For big-endian: $s[$i] = chr(($n >> 8 * (4 - 1 - $i)) & 0xff);
    $s[$i] = chr(($n >> 8 * $i) & 0xff);
}

But these are not performant, I wonder if there is some native method that does the job. But I haven't found any for now.

decbin is not the right method, it converts an integer to a textual binary string. I mean an actual binary string, not a textual binary string (See the title of the question). — 張俊芝
– 張俊芝, Commented Mar 8, 2021 at 5:08
Unbale to understand the difference between actual binary string and textual binary string — Death-is-the-real-truth
– Death-is-the-real-truth, Commented Mar 8, 2021 at 5:32
Understand and run my code, and then var_dump($s). And then run var_dump(decbin($n));. — 張俊芝
– 張俊芝, Commented Mar 8, 2021 at 5:43

張俊芝 · Accepted Answer · 2021-03-08 05:57:37Z

1

After some search, I found two ways to achieve this:

The better of the two slutions, that I am going to use:

$n = 0x12345678;
//For big-endian: var_dump(pack('N', $n));
var_dump(pack('V', $n));

and suboptimally:

$n = 0x12345678;
//This only supports big-endian.
var_dump(hex2bin(dechex($n)));

edited Mar 8, 2021 at 5:57

answered Mar 8, 2021 at 5:51

張俊芝

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