imagecreate
(PHP 4, PHP 5)
imagecreate — Create a new palette based image
Description
   resource imagecreate
    ( int $width
   , int $height
   )
  imagecreate() returns an image identifier representing a blank image of specified size.
We recommend the use of imagecreatetruecolor().
Parameters
- width
- 
      The image width. 
- height
- 
      The image height. 
Return Values
Returns an image resource identifier on success, FALSE on errors.
Examples
Example #1 Creating a new GD image stream and outputting an image.
<?php
header("Content-type: image/png");
$im = @imagecreate(110, 20)
    or die("Cannot Initialize new GD image stream");
$background_color = imagecolorallocate($im, 0, 0, 0);
$text_color = imagecolorallocate($im, 233, 14, 91);
imagestring($im, 1, 5, 5,  "A Simple Text String", $text_color);
imagepng($im);
imagedestroy($im);
?>
The above example will output something similar to:
