convert to bytes

[yosra]

hello
is there  any function that convert a decimal to bytes 
thanks in advance 

[Barand]

Can you give an example of what you are trying to achieve

[yosra]

i m tryin to  to create library that format a message (protocol NXCP http://wiki.netxms.org/wiki/Communication_Protocol_Reference_Guide)

 

 

ps: i m new in php
thank u for ur quick answer

NXCP.class.php

[lemmin]

I made this function a long time ago:

 

$d: (number) The decimal string

$bytes: (number) The number of bytes

$little: (bool) Little or Big Endian

	function encode($d, $bytes, $little = true)
	{
		$string = NULL;
		$h = dechex($d);
		if ((strlen($h)%2))
			$h = "0" . $h;
		if (!$little)
		{
			for ($i=0;$i<strlen($h);$i+=2)
				$string .= chr(hexdec($h[$i].$h[$i+1]));
		}
		else
		{
			for ($i=strlen($h)-1;$i>0;$i-=2)
				$string .= chr(hexdec($h[$i-1].$h[$i]));
		}
		$dif = $bytes-strlen($string);
		if ($dif < 0)
		{
			echo "Error: too big!";
			return false;
		}
		$head = NULL;
		for ($i=$dif;$i>0;$i--)
			$head .= chr(0);
			
		return ($little) ? ($string.$head) : ($head.$string);
	}

[Barand]

unpack and pack may be worth a look

[lemmin]

I remember now that I used pack() (along with my function) in the generation of the same binary data, but I can't remember exactly why I had to. I guess there was a format it couldn't do.

 

Anyway, pack() is definitely a better solution if it works.

[yosra]

thank u very much i will try it and i will get back to u