PHP imagecolorallocate

[floppydrivez]

A little tuff to explain, but this is not working on some servers.  This is the code

 

// Split the HTML color representation
$bgcolor = $_GET['bgcolor'];
$tcolor = $_GET['tcolor'];
function string_split($str, $nr){   
   return split("-l-", chunk_split($str, $nr, '-l-'));
}
$hexcolor1 = string_split($bgcolor, 2);
$hexcolor2 = string_split($tcolor, 2);

// Convert HEX values to DECIMAL
$bincolor1[0] = hexdec("0x{$hexcolor1[0]}");
$bincolor1[1] = hexdec("0x{$hexcolor1[1]}");
$bincolor1[2] = hexdec("0x{$hexcolor1[2]}");
$bincolor2[0] = hexdec("0x{$hexcolor2[0]}");
$bincolor2[1] = hexdec("0x{$hexcolor2[1]}");
$bincolor2[2] = hexdec("0x{$hexcolor2[2]}");
$font	= 2;
$width = strlen($protect_string) * ImageFontWidth($font);
$height	= ImageFontHeight($font);
$im = @imagecreate ($width,$height);
//Create background
$background_color = ImageColorAllocate($im, "$bincolor1[0]", "$bincolor1[1]", "$bincolor1[2]"); 
//Create Text
$text_color = ImageColorAllocate($im, "$bincolor2[0]", "$bincolor2[1]", "$bincolor2[2]");
imagestring ($im, $font, 0, 0,  $protect_string, $text_color);
imagejpeg ($im);
ImageDestroy($im);

 

Below are the errors

Warning: imagecolorallocate(): supplied argument is not a valid Image resource in ../Clan_Roster/files/protect.php on line 24

Warning: imagecolorallocate(): supplied argument is not a valid Image resource in ../Clan_Roster/files/protect.php on line 26

Warning: imagestring(): supplied argument is not a valid Image resource in ../Clan_Roster/files/protect.php on line 27

Warning: imagejpeg(): supplied argument is not a valid Image resource in ../Clan_Roster/files/protect.php on line 28

Warning: imagedestroy(): supplied argument is not a valid Image resource in ../Clan_Roster/files/protect.php on line 29

 

It works fine on some servers and not on others.  Does anyone know what might be causing this not to work on some?

[Jessica]

It's more likely the error reporting levels are different on the servers, and you only see the warnings on some.

You're surpressing the error that actually matters:

$im = @imagecreate ($width,$height);

 

Needs to be :

$im = imagecreate ($width,$height);

In order to get an error that will help.

[floppydrivez]

Results

Warning: imagecreate() [function.imagecreate]: Invalid image dimensions in ../Clan_Roster/files/protect.php on line 22

 

So there is an error in the width or height generated?  Any suggestions?

[Jessica]

$width = strlen($protect_string) * ImageFontWidth($font);

Where's $protect_string defined? If it's not, that will give you 0*# = 0, so you get a 0 width.

[floppydrivez]

http://www.testing.com/modules/Clan_Roster/files/[email protected]&bgcolor=6699CC&tcolor=EEEEEE

 

Like I said I have it working on serveral servers

[Jessica]

$protect_string = $_GET['protect_string'];

You have to $_GET a variable from the URL, you can't depend on Register_globals being on.

[floppydrivez]

Man, skipped right over that.  Thanks I learned a lot today.

[Jessica]

Just because something works on one server doesn't mean it will on another. You're depending on several INI settings that can easily vary server to server.