PHP Convert int to HEX

Question

How can I get a similar function with pack/unpack (or other short function)?

function getHEX($number) {
    switch($number) {
        case 0: $ret = "\x00\x00\x00\x00"; break;
        case 1: $ret = "\x00\x00\x00\x01"; break;
        case 2: $ret = "\x00\x00\x00\x02"; break;
        case 3: $ret = "\x00\x00\x00\x03"; break;
        // (...)

        default: $ret = "\x00\x00\x00\x00";
    }

    return $ret;
}

Answer 1

You could do it with dechex in PHP:

<?php
echo dechex(10) . "\n";
echo dechex(47);
?>

Answer 2

This function has solved my problem

pack("H*", sprintf("%08X", $number));

Answer 3

Here is a hint:

str_pad(dechex($number), 4, "0", STR_PAD_LEFT)