PHP Manual: Rotate an image with a given angle

Description

resource imagerotate ( resource $image , float $angle , int $bgd_color [, int $ignore_transparent = 0 ] )

Rotates the image image using the given angle in degrees.

The center of rotation is the center of the image, and the rotated image may have different dimensions than the original image.

Parameters

image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor.
angle: Rotation angle, in degrees. The rotation angle is interpreted as the number of degrees to rotate the image anticlockwise.
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

Returns an image resource for the rotated image, or FALSE on failure.

Changelog

Version	Description
5.5.0	The `ignore_transparent` is now silently ignored.
5.5.0	This function is now affected by the interpolation method set by the imagesetinterpolation function.
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);

// Free the memory
imagedestroy($source);
imagedestroy($rotate);
?>

The above example will output something similar to:

Notes

Note:
This function is affected by the interpolation method set by imagesetinterpolation.

imagerotate