PHP uses imagick to generate combined thumbnails

Let me show you the renderings first. If you are still satisfied, please continue reading:

The imagick mentioned here is an extension of ImageMagick under PHP. Installing it with pecl is easy and simple with just one command:

Copy the code The code is as follows:

sudo pecl install imagick

(you still need to add it in php.ini after the extension is installed) Go to extension=imagick.so, and then remember to restart the apache or php-fpm service.)

Recently, there is a need to combine multiple pictures to generate thumbnails, and I just want to use this powerful imagick extension.

This requirement is to generate thumbnails like this:

1. If there is 1 picture, directly generate a thumbnail of this picture;

2. If there are 2 pictures, one on the left and one on the Right side, half each;

3. If there are 3 pictures, the left sides of the two will be equally distributed, and one will occupy the right side;

4. If there are 4 pictures, the space will be evenly distributed like a field;

5. If there are more pictures, only take the first 4 pictures and generate thumbnails according to the grid pattern.

There are quite a few rules, but it’s not too complicated. I figured it out quickly:

namespace \clarence\thumbnail;
class Thumbnail extends \Imagick
{
/**
* @param array $images
* @param int $width
* @param int $height
* @return static
* @throws ThumbnailException
*/
public static function createFromImages($images, $width, $height){
if (empty($images)){
throw new ThumbnailException("No images!");
}
$thumbnail = new static();
$thumbnail->newImage($width, $height, 'white', 'jpg');
$thumbnail->compositeImages($images);
return $thumbnail;
}
public function compositeImages($images){
$imagesKeys = array_keys($images);
$compositeConfig = $this->calcCompositeImagesPosAndSize($images);
foreach ($compositeConfig as $index => $cfg){
$imgKey = $imagesKeys[$index];
$img = new \Imagick($images[$imgKey]);
$img = $this->makeCompositeThumbnail($img, $cfg);
$this->compositeImage($img, self::COMPOSITE_OVER, $cfg['to']['x'], $cfg['to']['y']);
}
}
protected function makeCompositeThumbnail(\Imagick $img, $cfg){
$img->cropThumbnailImage($cfg['size']['width'], $cfg['size']['height']);
return $img;
}
protected function calcCompositeImagesPosAndSize($images){
$width = $this->getImageWidth();
$height = $this->getImageHeight();
switch(count($images)){
case 0:
throw new ThumbnailException("No images!");
case 1:
// | 0 |
return [
0 => [
'to' => [ 'x' => 0, 'y' => 0 ],
'size' => [
'width' => $width,
'height' => $height,
]
]
];
case 2:
// | 0 | 1 |
return [
0 => [
'to' => [ 'x' => 0, 'y' => 0 ],
'size' => [
'width' => $width / 2,
'height' => $height,
]
],
1 => [
'to' => [ 'x' => $width / 2, 'y' => 0],
'size' => [
'width' => $width / 2,
'height' => $height,
]
]
];
case 3:
// | 0 | 1 |
// | 2 | |
return [
0 => [
'to' => [ 'x' => 0, 'y' => 0 ],
'size' => [
'width' => $width / 2,
'height' => $height / 2,
]
],
1 => [
'to' => [ 'x' => $width / 2, 'y' => 0],
'size' => [
'width' => $width / 2,
'height' => $height,
]
],
2 => [
'to' => [ 'x' => 0, 'y' => $height / 2 ],
'size' => [
'width' => $width / 2,
'height' => $height / 2,
]
],
];
default:
// >= 4:
// | 0 | 1 |
// | 2 | 3 |
return [
0 => [
'to' => [ 'x' => 0, 'y' => 0 ],
'size' => [
'width' => $width / 2,
'height' => $height / 2,
]
],
1 => [
'to' => [ 'x' => $width / 2, 'y' => 0],
'size' => [
'width' => $width / 2,
'height' => $height / 2,
]
],
2 => [
'to' => [ 'x' => 0, 'y' => $height / 2 ],
'size' => [
'width' => $width / 2,
'height' => $height / 2,
]
],
3 => [
'to' => [ 'x' => $width / 2, 'y' => $height / 2],
'size' => [
'width' => $width / 2,
'height' => $height / 2,
]
],
];
}
}
}

Try it out:

Copy the code The code is as follows:

$thumbnail = clarencethumbnailThumbnail::createFromImages($srcImages, 240, 320);
$thumbnail->writeImage($outputDir."/example.jpg");

The above content introduces how PHP uses imagick to generate combinations I hope this helps everyone with the relevant knowledge about thumbnails!

The above introduces the use of imagick in PHP to generate combined thumbnails, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.