PHP | imagerotate() Function

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 =
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-15.png';

// 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