PHP : Function Reference : Miscellaneous Functions : pack PHP Examples Tutorials References

chr dot eichert

This is how you can produce a code that is in fact a picture. (This code is a complete tool, copy it to a file, call it 'somehow.php' and produce your pictures as hexcode).  <form method="post" action="<?php echo $_SERVER['PHP_SELF'];?>" enctype="multipart/form-data"> <input type="file" name="thefile"><input type="submit"> </form> <?php $rh = fopen ($_FILES['thefile']['tmp_name'], "r"); $pb = fread($rh, 8192); fclose($rh); $pc = bin2hex($pb); $pd = wordwrap($pc, 76, "\".<br /> \n \"", 1); echo "<TT>\$hexpic=\""."$pd"."\"\n</TT>;"; ?>  Copy the result in your site code somewhere. For to show the code as a picture you can use something like what dirk (at) camindo de wrote ... <?php $hexpic="....................... ....................."; $data = pack("H" . strlen($hexpic), $hexpic); header("Content-Type: image/png"); // maybe your is jpeg / gif / png header("Last-Modified: " . date("r", filectime($_SERVER['SCRIPT_FILENAME']))); header("Content-Length: " . strlen($data)); echo $data; ?> have fun!

dylan

This is how I used pack to convert base2 to base64 since base_convert doesn't support base64 The base conversions don't work for long strings, which is why I convert 1 byte at a time Hope this helps someone function base2to64($base2) { if ($remainbits = strlen($base2)%8) $base2 .= str_repeat('0',8-$remainbits); $base64 = NULL; for ($i=0;$i<strlen($base2);$i+=8) $base16 .= sprintf('%02x',bindec(sprintf('%08d',substr($base2,$i,8)))); return base64_encode(pack('H*',$base16)); } function base64to2($base64) { list($base16) = unpack('H*0',base64_decode($base64)); $base2 = NULL; for ($i=0;$i<strlen($base16);$i++) $base2 .= sprintf('%04d',base_convert(substr($base16,$i,1),16,2)); return $base2; }

jurgen braam

take note: if you produce binary files using PHP on multiple platforms, that you use one of the machine-independent pack options. This means 's' 'S' 'i' 'I' 'd' and 'f' are _EVIL_ :) Took me some time to figure out what my Excel-generator what futzing about :) Turned out the production machine was a Sun Sparc. I develop on my own x86 Linux server. Hope this helps anyone... c-ya, Jurgen

plutus

Note that the the upper command in perl looks like this: $binarydata = pack ("n v c*", 0x1234, 0x5678, 65, 66); In PHP it seems that no whitespaces are allowed in the first parameter. So if you want to convert your pack command from perl -> PHP, don't forget to remove the whitespaces!

mfisch

If you are trying to do ascii <--> binary conversions like me; you probably found that unlike the perl pack functions, these wont help too much. Attached are two functions I wrote to accomplish this task. function bin2asc ($binary) { $i = 0; while ( strlen($binary) > 3 ) { $byte[$i] = substr($binary, 0, 8); $byte[$i] = base_convert($byte[$i], 2, 10); $byte[$i] = chr($byte[$i]); $binary = substr($binary, 8); $ascii = "$ascii$byte[$i]"; } return $ascii; } function asc2bin ($ascii) { while ( strlen($ascii) > 0 ) { $byte = ""; $i = 0; $byte = substr($ascii, 0, 1); while ( $byte != chr($i) ) { $i++; } $byte = base_convert($i, 10, 2); $byte = str_repeat("0", (8 - strlen($byte)) ) . $byte; # This is an endian (architexture) specific line, you may need to alter it. $ascii = substr($ascii, 1); $binary = "$binary$byte"; } return $binary; } Im not sure these are the most efficient functions, but surely alot faster than loading up a perl interpreter for every binary conversion =)

19-feb-2005 07:09

I needed to convert binary values from a file to integers. Maybe there is something simpler, but the snippets i saw above seemed a little convoluted: function bin2asc ($binary) { $val = 0; for ($i = strlen($binary) - 1; $i >= 0; $i--) { $ch = substr($binary, $i, 1); $val = ($val << 8) | ord($ch); } return $val; } This was called like the following from a binary file: function _readInt($fp) { return bin2asc(fread($fp, 4)); } Note that the for loop should be reversed for network byte order instead of intel byte order. Also the conversion will work with any number of bytes, but will happily overflow.

zilinex

a cool function to converrt numbers to Persian numbers(utf-8) origin: http://www.farsiweb.info/jalali/jalali.phps function farsinum($str) { $ret = ""; for ($i = 0; $i < strlen($str); ++$i) { $c = $str[$i]; if( $c >= '0' && $c <= '9' ) $out .= pack("C*", 0xDB, 0xB0 + $c); else $ret .= $c; } return $ret; }

j.s.hoekstra

/* Convert float from HostOrder to Network Order */ function FToN( $val ) { $a = unpack("I",pack( "f",$val )); return pack("N",$a[1] ); } /* Convert float from Network Order to HostOrder */ function NToF($val ) { $a = unpack("N",$val); $b = unpack("f",pack( "I",$a[1])); return $b[1]; }

pack

Pack data into binary string (PHP 4, PHP 5)
string pack ( string format [, mixed args [, mixed ...]] )

Example 1360. pack() example

Related Examples ( Source code ) » pack

Code Examples / Notes » pack

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