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Title : a little counter-script for PHP. Needs the gd-library and Colors.php
Categories : Graphics, PHP, Complete Programs Update Picture
Claus Radloff
Date : Jan 17th 1999
Grade : 3 of 5 (graded 5 times)
Viewed : 17195
File : No file for this code example.
Images : No Images for this code example.
Search : More code by Claus Radloff
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Tools : My Examples List

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<?
/////////////////////////////////////////////////////////////////////////
//
// counter.php - implements a simple Counter
//
// Author: Claus Radloff
//
// Description:
// The counter in this file can count multiple counters. Therefore
// every counter gets it´s own identifier.
// The Fore- and Backgroundcolor and the number of digits are
// defined, but can be overwritten. Fore- and Backgroundcolor may
// be transparent as well.
// The Parameters are passed in the URL.
// Some Examples:
// simple counter:
// <img src="counter.php?Identifier=Test">
//
// Counter with red background
// <img src="counter.php?Identifier=Test&BGColor=255+0+0">
// or:
// <img src="counter.php?Identifier=Test&BGColor=red">
//
// Counter with red background, green foreground and 4 digits
// <img src="counter.php?Identifier=Test&BGColor=255+0+0&FGColor=0+255+0&Length=4">
// or:
// <img src="counter.php?Identifier=Test&BGColor=red&FGColor=green&Length=4">
//
// Counter with transparent background and red foreground
// <img src="counter.php?Identifier=Test&BGColor=transparent&FGColor=red">
//

Header( "Content-type: image/gif");

require( "colors.php");

// Load the gd-library
// under Windooze use this one
// dl("php3_gd.dll");
// under UNIX use this one
dl( "php3_gd.so");

// some default-values
$Font = 5;
$BGColor = GetColor( "black");
$BGTrans = False;
$FGColor = GetColor( "white");
$FGTrans = False;
$Length = 7;

// get environment
$query_string = getenv( "QUERY_STRING");

// parse environment
// split query-string
$env_array = split( "&", $query_string);

// split in key=value and convert %XX
while (list($key, $val) = each($env_array))
{
// split
list($name, $wert) = split( "=", $val);

// replace %XX by character
$name = urldecode($name);
$wert = urldecode($wert);

// write to $cgivars
$CGIVars[$name] = $wert;
}

// eventually replace the default-values by the given parameters
if ($CGIVars[ "BGColor"])
{
if (ereg( "([0-9]*) ([0-9]*) ([0-9]*)", $CGIVars[ "BGColor"], $tmp))
{
$BGColor[ "red"] = $tmp[1];
$BGColor[ "green"] = $tmp[2];
$BGColor[ "blue"] = $tmp[3];
}
else if (eregi( "transparent", $CGIVars[ "BGColor"]))
{
$BGTrans = True;
}
else
{
$BGColor = GetColor($CGIVars[ "BGColor"]);
}
}

if ($CGIVars[ "FGColor"])
{
if (ereg( "([0-9]*) ([0-9]*) ([0-9]*)", $CGIVars[ "FGColor"], $tmp))
{
$FGColor[ "red"] = $tmp[1];
$FGColor[ "green"] = $tmp[2];
$FGColor[ "blue"] = $tmp[3];
}
else if (eregi( "transparent", $CGIVars[ "FGColor"]))
{
$FGTrans = True;
}
else
{
$FGColor = GetColor($CGIVars[ "FGColor"]);
}
}

if ($CGIVars[ "Length"])
{
$Length = $CGIVars[ "Length"];
}

// calculate size of image
$SizeX = $Length * 13;
$SizeY = 16;

// read counter-file
if (file_exists( "counter.txt"))
{
$fp = fopen( "counter.txt", "rt");
while ($Line = fgets($fp, 999))
{
// split lines into identifier/counter
if (ereg( "([^ ]*) *([0-9]*)", $Line, $tmp))
{
$CArr[ "$tmp[1]"] = $tmp[2];
}
}

// close file
fclose($fp);

// get counter
$Counter = $CArr[$CGIVars[ "Identifier"]];
$Counter += 1;
$CArr[$CGIVars[ "Identifier"]] = $Counter;
}
else
{
// the new counter is initialized with 1
$CArr[$CGIVars[ "Identifier"]] = 1;
$Counter = 1;
}

// write counter file
$fp = fopen( "counter.txt", "wt");

// output array elements
reset($CArr);
while (list($Key, $Value) = each($CArr))
{
$tmp = sprintf( "%s %d\n", $Key, $Value);
fwrite($fp, $tmp);
}

// close file
fclose($fp);

// Counter mit führenden Nullen auffüllen
// fill counter with leading 0´s
$Counter = sprintf( "%0".$Length. "d", $Counter);

// create image
$img = ImageCreate($SizeX + 4, $SizeY + 4);

// use interlace
ImageInterlace($img, 1);

// transparent color for separators
$trans = ImageColorAllocate($img, 1, 1, 1);
ImageColorTransparent($img, $trans);

// fill background
if ($BGTrans)
{
ImageFill($img, 1, 1, $trans);
}
else
{
$col = ImageColorAllocate($img, $BGColor[ "red"], $BGColor[ "green"],
$BGColor[ "blue"]);
ImageFill($img, 1, 1, $col);
}

// output digits
if ($FGTrans)
{
$col = $trans;
}
else
{
$col = ImageColorAllocate($img, $FGColor[ "red"], $FGColor[ "green"],
$FGColor[ "blue"]);
}

$PosX = 0;
for ($i = 1; $i <= strlen($Counter); $i++)
{
ImageString($img, $Font, $PosX + 3, 2 + $i % 2,
substr($Counter, $i - 1, 1), $col);

if ($i != 1)
{
// draw separator
ImageLine($img, $PosX, 0, $PosX, $SizeY + 4, $trans);
}

$PosX += 13;
}

// output image
ImageGif($img);
ImageDestroy($img);
?>



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 Supreme Creature wrote : 159
I can`t find this "gd-library" from anywhere, can anybody 
direct me to it? 
 
 Sjon wrote : 160
And where`s that colors.php script then...
Please provide me with an url or something...


Thanx, Sjon.
 
 Claus Radloff wrote : 202
The gd-library is part of the binary distributions of PHP (at least
under Windows). It will be built, when compiling the source
distribution, if you have installed the gdlib, which should be 
part of the most Linux distributions.

The Colors script is available here in the section graphics and
is titled `Definition of Colornames`

Regards

Claus
 
 mator wrote :268
where the $%^& workin` example?