Write text to a .png with php

Posted by Andy Bailey at 31 August, 2007, 6:30 pm
5

I just read a wicked tutorial on DiscoMoose on how to add text onto an existing png file and now I'm ready to make my next widget! it's going to be a custom link box with a variety of button styles to choose from. Choose any text and the button will be displayed with the text on there.

It might save a lot of trouble for newbies who don't have experience in coding or if someones best image app is MSPaint!

here's my first test to see if I could run the code..

dynamic button

it is called with http://www.fiddyp.co.uk/internal/testingphp/png.php?text=woot!

here is the code for png.php

PLAIN TEXT
PHP:
  1. // load the image from the file specified:
  2.  
  3. $im = imagecreatefrompng("button.png");
  4. // if there's an error, stop processing the page:
  5. if(!$im)
  6. {
  7.     die("");
  8. }
  9. // define some colours to use with the image
  10. $yellow = imagecolorallocate($im, 255, 255, 0);
  11. $black = imagecolorallocate($im, 0, 0, 0);
  12. // get the width and the height of the image
  13. $width = imagesx($im);
  14. $height = imagesy($im);
  15. // draw a black rectangle across the bottom, say, 20 pixels of the image:
  16. //imagefilledrectangle($im, 0, ($height-20) , $width, $height, $black);
  17. // now we want to write in the centre of the rectangle:
  18. $font = 4; // store the int ID of the system font we're using in $font
  19. $text = $_GET['text']; // store the text we're going to write in $text
  20. // calculate the left position of the text:
  21. $leftTextPos = ( $width - imagefontwidth($font)*strlen($text) )/2;
  22. // finally, write the string:
  23. imagestring($im,$font,$leftTextPos-1, $height-35,$text,$black);
  24. imagestring($im, $font, $leftTextPos, $height-36, $text, $yellow);
  25.  
  26. // output the image
  27. // tell the browser what we're sending it
  28. Header('Content-type: image/png');
  29. // output the image as a png
  30. imagepng($im);
  31. // tidy up
  32. imagedestroy($im);

yey!

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