E.g (vc++)
lNow=4221114;
ulNetVal = htonl (lNow);
ulNetVal give result 3127394304

In Vc++ htonl function can converts a u_long from host to TCP/IP network byte order (which is big-endian)

In PHP, Is there is any way we can do a convertioin like above vc++ example

My wrong understanding, If i use pack function. i expect the answer like above, But it result like this
<?php echo pack("N", "4221007"); ?> This is the result @hO

What should i do in order to get the result like above,
i.e converts a u_long from host to TCP/IP network byte order (which is big-endian).

Thanks in advance...:confused:

The result that you get is the correct one.

@ has value 64
h has value 104
O has value 79

64*256^2 + 104*256 +79 = 4221007

You just have to interpret the string as a u_long.

HTH

*** EDIT ***

After looking at the function specs on php.net I believe you have to use V and not N. So that your number that you give to pack() will be interpreted in the reverse order.

*** EDIT #2 ***

I've tried 4221114 with the V parameter and it gives back

ºh@_ (the last _ is just a null character)

which is:

186*256^3 + 104*256^2 + 64*256 = 3127394304

just like you want it to be.

Sorry for the double post but can't edit after 15 minutes

Thanks you much for your nice help..

Sorry again

186*256^3 + 104*256^2 + 64*256 = 3127394304

i.e 186*256^3=3120562176 (By Calculator) which is correct

But when i do it PHP 186*256^3=47619, ^ operator(Dont know how to implment it)

$BigEndian=pack ('V', 4221114);
for($i=1;$i<(strlen($BigEndian)+1);$i++)
{echo $AscIn+=ord(substr($BigEndian,-$i,1))*256^3;
echo "<br>";}

kindly aske for the help...

$val = unpack('Nbig', pack('V', 4221114));
echo $val['big'];


Returns -1167572992 which is the number you want (but interpreted as signed). I think you can just use that value in the network function.

Actually i am trying to convert some source from vc++ to PHP, Follow some server protocol and client sent a data to server.
************************************
The following is the VC++Source Code
************************************
This are the value passed to through the variables underneath mathemetical function

end_byte=9
end_bit=0
value=3868147712
************************************
byte_pos = end_byte;
width_mask = (BYTE) (((1 << (7 - end_bit)) - 1) << 1 | 1);
byte_value = (BYTE) (value & width_mask);
byte_value <<= end_bit;
value >>= (7 - end_bit + 1);
or_mask = (BYTE) (width_mask << end_bit);
and_mask = (BYTE) (~or_mask);
p_buff[byte_pos] &= and_mask;
p_buff[byte_pos] |= byte_value;
byte_pos--;
************************************

If u can explain what is going on here, it would be much easier rather than just apply this, more over vc++ return different value and php return different value, and also i cant find the relevant functions in php, my code is like this

$byte_pos = $end_byte;
echo "BytPost=$byte_pos";echo "<br>";

$width_mask = decbin(((1 << (7 - $end_bit)) - 1) << 1 | 1);
echo "2width_mask=$width_mask"."<br>";
echo "value=$value";echo "<br>";
$byte_value = (decbin($value) & $width_mask);

echo "end_bit=$end_bit"."<br>";
$byte_value <<= $end_bit;

echo "Bytevalue=$byte_value"."<br>";
$value >>= (7 - $end_bit + 1);

echo "value=$value";echo "<br>";
$or_mask = ($width_mask << $end_bit);
$and_mask = (~$or_mask);
$p_buff[$byte_pos] &= $and_mask;

$bits="";
for($i=0;$i<($len-strlen($byte_value));$i++){$bits.="0";}

$byte_value=$bits.$byte_value;
echo "2byte_value=$byte_value"."<br>";
$p_buff[$byte_pos] |= $byte_value;echo "2p_buff[$start_byte]=$p_buff[$start_byte]"."<br>";
$byte_pos--;
echo "ByteDecre--=".$byte_pos."<br>";

Vc++ retruns
(htons=16-bit number in host byte order. )
(htonl=32-bit number in host byte order.)
nmax=16
ulNetVal = (unsigned long) htons ((unsigned short) (nMax + 2));
ulNetVal returns 4608,

PHP
For (htonl=32-bit number in host byte order.)
$val = unpack('Nbig', pack('V', 4221114));
echo $val['big'];
which is correct 32bit

for 16Bit, if u would help me much easier, thanks for your helps.

Hi there,
can u pls help me, how to make the number for eg 18 into 2bytes i.e 16 bits

$ulNetVal =pack('N', 18)."<br>";

Thanks in advance

You're probably not going to like what I'm going to say but still...

Always read the manual first...

you said you didn't know how to implement the ^ operator... i'm sure you know x^y means x rised to the power of y. Please look at this page:

http://www.php.net/manual/en/ref.math.php

As a matter of fact, looking through that manual will probably help you a lot. I would focus on the socket library among others. "ALWAYS look and think before you ask, not only do you learn more you also avoid looking like an ***" That's what my dad use to say to me ;)