How to use the imageflip function to flip images in multi-graphic synthesis?

How to achieve image flip in multi-graphic synthesis through PHP's imageflip function?

PHP provides some powerful image processing functions that can help developers easily implement image flip, crop, synthesis and other functions. In this article, we will introduce how to use PHP's imageflip function to implement image flip and apply it to multi-graphic synthesis scenarios.

The imageflip function is a member of the PHP image processing function library and can be used to flip images. The flip includes horizontal flip, vertical flip, etc. We will use actual code examples to show how to use this function to flip an image and synthesize the flipped image with other images.

Introduction to imageflip function

The basic usage of the imageflip function is as follows:

 imageflip(resource $image, int $mode): bool

• $image : This is an image resource that needs to be flipped, usually loaded through functions such as imagecreatefromjpeg , imagecreatefrommpng , etc.

• $mode : The type of flip mode, the following constants can be used:

  • IMG_FLIP_HORIZONTAL : Horizontal flip

  • IMG_FLIP_VERTICAL : Vertical flip

  • IMG_FLIP_BOTH : Flip horizontally and vertically simultaneously

The function returns true to success, and false to failure.

Image flip

Suppose we have two images, the first one needs to be flipped and synthesized with the second one. The code implementation is as follows:

 <?php
// Load two pictures
$image1 = imagecreatefromjpeg('https://gitbox.net/path/to/your/image1.jpg');
$image2 = imagecreatefromjpeg('https://gitbox.net/path/to/your/image2.jpg');

// Flip the first image horizontally
imageflip($image1, IMG_FLIP_HORIZONTAL);

// Get the width and height of the second image
$image2_width = imagesx($image2);
$image2_height = imagesy($image2);

// Create a new composite image
$combined_image = imagecreatetruecolor($image2_width + imagesx($image1), max(imagesy($image1), $image2_height));

// Copy the second image to the composite image
imagecopy($combined_image, $image2, 0, 0, 0, 0, $image2_width, $image2_height);

// Copy the first flipped image to the composite image
imagecopy($combined_image, $image1, $image2_width, 0, 0, 0, imagesx($image1), imagesy($image1));

// Output the synthesized image
header('Content-Type: image/jpeg');
imagejpeg($combined_image);

// Free memory
imagedestroy($image1);
imagedestroy($image2);
imagedestroy($combined_image);
?>

Code parsing

1. Loading the image : First, we load two images through imagecreatefromjpeg .

2. Flip the image : Use the imageflip function to flip the first image horizontally. You can modify the flip mode as needed.

3. Create a composite image : Create a new image resource with imagecreatetruecolor , with the sum of the widths of the two images (maintaining maximum height).

4. Copy the image to composite image : Use the imagecopy function to copy the second image and the flipped first image to the new composite image.

5. Output synthetic image : output the synthesized image through imagejpeg and display it in the browser.

6. Free memory : After operating the image, release image resources through the imagedestroy function to avoid memory leakage.

Summarize

Through PHP's imageflip function, we can easily flip the image and synthesize the flipped image with other images to form complex image effects. In actual development, this method can be used for various purposes such as generating creative pictures, making picture splicing, etc.