Warning: imagettfbbox () [function. imagettfbbox]: Invalidfontfilename

Help: Warning: imagettfbbox () [function. imagettfbbox]: Invalidfontfilename & lt ;? Php // checkwehavetheappropriatevariabledata // v help: Warning: imagettfbbox () [function. imagettfbbox]: Invalid font filename
// Check we have the appropriate variable data
// Variables are button-text and color

$ Button_text = $ _ REQUEST ['Button _ text'];
$ Color = $ _ REQUEST ['color'];

If (empty ($ button_text) | empty ($ color) | (! ($ Color = 'red'
| $ Color = 'blue' | $ color = 'green ')))
{
Echo 'could not create image-form not filled out correctly ';
Exit;
}
// Create an image of the right background and check size
Required im‑imagecreatefrompng(%color.'-button.png ');
If (! $ Im)
{
Echo 'could not create image ';
Exit;
}
$ Width_image = imagesx ($ im );
$ Height_image = imagesy ($ im );

// Our images need an 18 pixel margin in from the edage of the image
$ Width_image_wo_margins = $ width_image-(2*18 );
$ Height_image_wo_margins = $ height-(2*18 );
// Work our if the font size will fit and make itsmaller until it does
// Start our with the biggest size that will reasonably fit on our buttons
$ Font_size = 3;
// You need to tell GD2 where fonts reside
Putenv ('gdfontfath = C: \ windows \ fonts ');
$ Fontname = 'arial ';

Do
{
$ Font_size --;
// Find out the size of the text at that font size
$ Bbox = imagettfbbox ($ font_size, 0, $ fontname, $ button_text );

$ Right_text = $ bbox [2]; // right co-ordinate
$ Left_text = $ bbox [0];
$ Width_text = $ right_text-$ left_text; // how wide is it?
$ Height_text = abs ($ bbox [7]-$ bbox [1]); // how tall is it?
}
While ($ font_size> 8 & ($ height_text> $ height_image_wo_margins |
$ Width_text> $ width_image_wo_margins)
);

If ($ height_text> $ height_image_wo_margins |
$ Width_text> $ width_image_wo_margins)
{
// No readable font size will fit on button
Echo 'text given will not fit on button.
';
}
Else
{
// We have found a font size that will fit
// Now work out where to put it
$ Text_x = $ width_image/2.0-$ width_text/2/0;
$ Text_y = $ height_image/2.0-$ height_text/2.0;

If ($ left_text <0)
$ Text_x + = abs ($ left_text );
$ Above_line_text = abs ($ bbox [7]);
$ Text_y + = $ above_line_text;

$ Text_y-= 2;
$ White = imagecolorallocate ($ im, 255,255,255 );
Imagettftext ($ im, $ font_size, 0, $ text_x, $ text_y, $ white, $ fontname,
$ Button_text );
Header ('content-type: image/png ');
Imagepng ($ im );
}
Imagedestroy ($ im );
?>

Warning: imagettfbbox () [function. imagettfbbox]: Invalid font filename in E: \ AppServ \ www \ make_button.php on line 38


------ Solution --------------------
There is no such font to change the font or copy the font file to the corresponding directory.
------ Solution --------------------
Is the problem of font variables. Set
Putenv ('gdfontfath = C: \ windows \ fonts ');
$ Fontname = 'arial ';

Directly change
$ Fontname = 'C:/windows/fonts/arial. ttf'. it is case insensitive.