imagerotate
(PHP 4 >= 4.3.0, PHP 5)
imagerotate -- Rotate an image with a given angle
Description
resource
imagerotate ( resource source_image, float angle, int bgd_color [, int ignore_transparent] )
Rotates the source_image image using the given
angle in degrees.
The center of rotation is the center of the image, and the rotated
image is scaled down so that the whole rotated image fits in the
destination image - the edges are not clipped.
Parameters
source_image
The source image link
angle
Rotation angle, in degrees.
bgd_color
Specifies the color of the uncovered zone after the rotation
ignore_transparent
If set and non-zero, transparent colors are ignored (otherwise kept).
Examples
Example 1. Rotate an image 180 degrees
This example rotates an image 180 degrees - upside down.
<?php
// File and rotation
$filename = 'test.jpg';
$degrees = 180;
// Content type
header('Content-type: image/jpeg');
// Load
$source = imagecreatefromjpeg($filename);
// Rotate
$rotate = imagerotate($source, $degrees, 0);
// Output
imagejpeg($rotate);
?>
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The above example will output
something similar to: 
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Notes
Note: This function is only available if
PHP is compiled with the bundled version of the GD library.