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How to make an image with php

By liviu - Posted on May 22nd, 2009
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This is a nice example of how to make an image with php using the GD extension.
It was taken from

Programming PHP, 2nd Edition
By Rasmus Lerdorf, Peter MacIntyre, Kevin Tatroe

"

With PHP, you can easily create and manipulate images using the GD extension. Example 1-5 provides a text-entry field that lets the user specify the text for a button. It takes an empty button image file, and on it centers the text passed as the GET parameter "message." The result is then sent back to the browser as a PNG image.

"

<?php
 if (isset($_GET['message'])) {
   // load font and image, calculate width of text
   $font = 'times';
   $size = 12;
   $im = ImageCreateFromPNG('button.png');
   $tsize = imagettfbbox($size,0,$font,$_GET['message']);

   // center
   $dx = abs($tsize[2]-$tsize[0]);
   $dy = abs($tsize[5]-$tsize[3]);
   $x = ( imagesx($im) - $dx ) / 2;
   $y = ( imagesy($im) - $dy ) / 2 + $dy;

   // draw text
   $black = ImageColorAllocate($im,0,0,0);
   ImageTTFText($im, $size, 0, $x, $y, $black, $font, $_GET['message']);

   // return image
   header('Content-type: image/png');
   ImagePNG($im);
   exit;
 }
?>
<html>
  <head><title>Button Form</title></head>
  <body>

    <form action="<?= $PHP_SELF ?>" method="GET">
      Enter message to appear on button:
      <input type="text" name="message" /><br />
      <input type="submit" value="Create Button" />
    </form>

  </body>
</html>

 

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