The imagerotate() function is an inbuilt function in PHP which is used to rotate an image with a given angle in degrees. The rotation center of the image is center.
Syntax:
resource imagerotate( $image, $angle, $bgd_color, $ignore_transparent = 0 )
Parameters: This function accepts four parameters as mentioned above and described below:
- $image: It is returned by one of the image creation functions, such as imagecreatetruecolor(). It is used to create size of image.
- $angle: This parameter holds the rotation angle in degrees. The rotation angle is used to rotate an image in anticlockwise direction.
- $bgd_color: This parameter holds the background color of uncovered zone after rotation.
- $ignore_transparent: If this parameter set and non-zero then transparent colors are ignored.
Return Value: This function returns an image resource for the rotated image on success, or False on failure.
Below programs illustrate the imagerotate() function in PHP:
Program 1:
<?php // Assign image file to variable $image_name = // Load image file $image = imagecreatefrompng($image_name); // Use imagerotate() function to rotate the image $img = imagerotate($image, 180, 0); // Output image in the browser header("Content-type: image/png"); imagepng($img); ?> |
Output:
Program 2:
<?php // It create the size of image or blank image. $image = imagecreatetruecolor(500, 300); // Set the background color of image. $bg = imagecolorallocate($image, 205, 220, 200); // Fill background with above selected color. imagefill($image, 0, 0, $bg); // Set the color of an ellipse. $col_ellipse = imagecolorallocate($image, 0, 102, 0); // Function to draw the filled ellipse. imagefilledellipse($image, 250, 150, 400, 250, $col_ellipse); // Use imagerotate() function to rotate the image $img = imagerotate($image, 90, 0); // Output image in the browser header("Content-type: image/png"); imagepng($img); ?> |
Output:
Reference: https://www.php.net/manual/en/function.imagerotate.php
