Mine

<?php  if ( !$_GET['created'] ){    echo <<< EOHTML    <style type="text/css">    input,input.btn{      color:#050;      font-family:'trebuchet ms',helvetica,sans-serif;      font-size:84%;      font-weight:bold;      background-color:#fed;      border:1px solid;      border-top-color:#696;      border-left-color:#696;      border-right-color:#363;      border-bottom-color:#363;}      </style>      <form action="gradient.php">      <fieldset><legend>create a gradient</legend>      left color:&nbsp#      <input type="text" size="7" maxlength="6" name="left" id="" value=""/><br>        right color:&nbsp#      <input type="text" size="7" maxlength="6" name="right" id="" value=""/><br>        width:      <input type="text" size="4" maxlength="4" name="width" id="" value=""/><br>        height:      <input type="text" size="4" maxlength="4" name="height" id="" value=""/><br>        <input type="hidden" name="created" value="1"/>      <input class="btn" type="submit" value="create"/>      </fieldset>      </form>EOHTML;      exit;  }  $leftR = hexdec(substr($_GET["left"],0,2));  $leftG = hexdec(substr($_GET["left"],2,2));  $leftB = hexdec(substr($_GET["left"],4,2));  $rightR = hexdec(substr($_GET["right"],0,2));  $rightG = hexdec(substr($_GET["right"],2,2));  $rightB = hexdec(substr($_GET["right"],4,2));  $image=imagecreate($_GET["width"],$_GET["height"]);  for($i=0;$i<250;$i++) {    $colorset[$i] = imagecolorallocate($image, $leftR + ($i*(($rightR-$leftR)/250)), $leftG + ($i*(($rightG-$leftG)/250)), $leftB + ($i*(($rightB-$leftB)/250)));  }  for ($y=0;$y<$_GET['height'];$y++){    for($x=0;$x<($_GET["width"]);$x++) {      imagesetpixel ($image, $x, $y, $colorset[(int)($x/($_GET["width"]/250))] );    }  }  header("Content-type: image/png");  imagepng($image);  imagedestroy($image);?><?PHP  $captchastringarray=array_fill(0, 5, rand(65, 90)); // Generate array of ASCII values from 65 to 90  $captchastring=""; // Create a placeholder variable for the string  foreach($captchastringarray as $character) { // For every ASCII value in the array  $captchastring.=chr($character); // Add the character onto the string  }  $XSIZE=200; // Width of the image  $YSIZE=100; // Height of the image  $im=imagecreate($XSIZE,$YSIZE); // Create a 200x100 image  $white=imagecolorallocate($im, 255, 255, 255); // Allocated the index for black  $black=imagecolorallocate($im, 0, 0, 0); // Allocated the index for black  imagestring($im, 3, 0, 0, $captchastring, $black); // Write the CAPTCHA string in black at (0,0)  //  header("Content-Type: image/jpeg");  imagepng($im);  imagedestroy($im);?>