php string to hex with2's complement:

Question

Hi I have a string 193390663 which I want to convert into the hex with 2's compliment. The output is 0B86E847

Right now I am using below function but it's giving me 313933333930363633

 public static function String2Hex($string)
{
    $hex = '';
    for($i=0; $i<strlen($string); $i++)
    {
        $hex.=dechex(ord($string[$i]));
    }
}

Update 1

Tried this

 $sub2 = substr($m->msn,4,9);
            $m->m_hex = dechex ($sub2);

Output

b86e847

But I want output like 0B86E847

Any help would be highly appreciated.

@NigelRen So what is the correct way of getting hex with 2's compliment ? — Moeez
– Moeez, Commented May 22, 2020 at 12:26

Dipesh Parmar · Accepted Answer · 2020-05-25 05:53:15Z

1

Solution you are looking for is as below,

It is referenced from one of the answer given at Create hex-representation of signed int in PHP.

<?php

function signed2hex($value, $reverseEndianness = true)
{
    $packed = pack('i', $value);
    $hex='';
    for ($i=0; $i < 4; $i++){
        $hex .= strtoupper( str_pad( dechex(ord($packed[$i])) , 2, '0', STR_PAD_LEFT) );
    }
    $tmp = str_split($hex, 2);
    $out = implode('', ($reverseEndianness ? array_reverse($tmp) : $tmp));
    return $out;
}

echo signed2hex(193390663);

answered May 25, 2020 at 5:53

Dipesh Parmar

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