PHP: imagerotate function - Rotate an image with a given angle

Description

resource imagerotate ( resource $image , float $angle , int $bgd_color [, int $ignore_transparent ] )

Rotates the 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

image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
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).

Return Values

ChangeLog

Version	Description
5.1.0	`ignore_transparent` was added.

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);
?>

The above example will output something similar to:

Notes

Note: This function is only available if PHP is compiled with the bundled version of the GD library.