Let's talk about Image operations in thinkphp

The followingthinkphp frameworktutorial column will introduce you to the Image operation in thinkphp3.2.3. I hope it will be helpful to friends in need!

Image operation in independent thinkphp3.2.3

Refer to Image operation in thinkphp3.2.3

https://www. kancloud.cn/manual/thinkphp/1878

Does not depend on any framework

Under normal circumstances, the gd library will be installed

If you need Imagick, please install https://pecl.php. net/package/imagick

Installation

composer require whereof/think-image

Instantiation class library

$image = new \whereof\ThinkImage\Image();

The GD library is used by default for image operations. If you need to use the Imagick library for operation, you need Change to:

$image = new \whereof\ThinkImage\Image(\Think\Image::IMAGE_IMAGICK); 
// 或者采用
$image = new \whereof\ThinkImage\Image('Imagick');

Image operation

Let’s take a look at how to use the basic image operation function.

Open the image file

Assume there is a 1.jpg file under the current entry file directory

Use the open method to open the image file for related operations:

$image = \whereof\ThinkImage\Image(); 
$image->open('./1.jpg');

It can also be simplified to the following method:

$image = new \whereof\ThinkImage\Image(\whereof\ThinkImage\Image::IMAGE_GD,'./1.jpg'); // GD库
// 或者
$image = new \whereof\ThinkImage\Image(\whereof\ThinkImage\Image::IMAGE_IMAGICK,'./1.jpg');  // imagick库

Get image information

You can get the information of opening the picture, including image size, type, etc., for example:

$width = $image->width(); // 返回图片的宽度
$height = $image->height(); // 返回图片的高度
$type = $image->type(); // 返回图片的类型
$mime = $image->mime(); // 返回图片的mime类型
$size = $image->size(); // 返回图片的尺寸数组 0 图片宽度 1 图片高度

Crop picture

Use crop and save methods to complete the image cropping function.

//将图片裁剪为400x400并保存为corp.jpg
$image->crop(400, 400)->save('./crop.jpg');

Supports cropping starting from a certain coordinate, for example, starting from (100, 30):

//将图片裁剪为400x400并保存为corp.jpg
$image->crop(400, 400,100,30)->save('./crop.jpg');

Generate thumbnails

Use the thumb method to generate thumbnails

// 按照原图的比例生成一个最大为150*150的缩略图并保存为thumb.jpg
$image->thumb(150, 150)->save('./thumb.jpg');

can support other types of thumbnail generation. The settings include the following constants or corresponding numbers of \whereof\ThinkImage\Image:

IMAGE_THUMB_SCALE     =   1 ; //等比例缩放类型
IMAGE_THUMB_FILLED    =   2 ; //缩放后填充类型
IMAGE_THUMB_CENTER    =   3 ; //居中裁剪类型
IMAGE_THUMB_NORTHWEST =   4 ; //左上角裁剪类型
IMAGE_THUMB_SOUTHEAST =   5 ; //右下角裁剪类型
IMAGE_THUMB_FIXED     =   6 ; //固定尺寸缩放类型

Centered cropping

// 生成一个居中裁剪为150*150的缩略图并保存为thumb.jpg
$image->thumb(150, 150,\whereof\ThinkImage\Image::IMAGE_THUMB_CENTER)->save('./thumb.jpg');

Upper left corner crop

$image->thumb(150, 150,\whereof\ThinkImage\Image::IMAGE_THUMB_NORTHWEST)->save('./thumb.jpg');

Scale filling

$image->thumb(150, 150,\whereof\ThinkImage\Image::IMAGE_THUMB_FILLED)->save('./thumb.jpg');

Fixed size

$image->thumb(150, 150,\whereof\ThinkImage\Image::IMAGE_THUMB_FIXED)->save('./thumb.jpg');

Add image watermark

//将图片裁剪为440x440并保存为corp.jpg
$image->crop(440, 440)->save('./crop.jpg');
// 给裁剪后的图片添加图片水印（水印文件位于./logo.png），位置为右下角，保存为water.gif
$image->water('./logo.png')->save("water.gif");
// 给原图添加水印并保存为water_o.gif（需要重新打开原图）
$image->open('./1.jpg')->water('./logo.png')->save("water_o.gif");

The second parameter of the water method represents the watermark Position, you can pass in the following Think\Imag class constants or corresponding numbers:

IMAGE_WATER_NORTHWEST =   1 ; //左上角水印
IMAGE_WATER_NORTH     =   2 ; //上居中水印
IMAGE_WATER_NORTHEAST =   3 ; //右上角水印
IMAGE_WATER_WEST      =   4 ; //左居中水印
IMAGE_WATER_CENTER    =   5 ; //居中水印
IMAGE_WATER_EAST      =   6 ; //右居中水印
IMAGE_WATER_SOUTHWEST =   7 ; //左下角水印
IMAGE_WATER_SOUTH     =   8 ; //下居中水印
IMAGE_WATER_SOUTHEAST =   9 ; //右下角水印

For example:

$image->open('./1.jpg')->water('./logo.png',\whereof\ThinkImage\Image::IMAGE_WATER_NORTHWEST)->save("water.jpg");

It can also support the transparency of the watermark image (0~100, the default value is 80) , for example:

$image->open('./1.jpg')->water('./logo.png',\whereof\ThinkImage\Image::IMAGE_WATER_NORTHWEST,50)->save("water.jpg");

can also support adding text watermarks to pictures (assuming there is a 1.ttf font file in the same directory as the entry file), for example:

$image->open('./1.jpg')->text('ThinkPHP','./1.ttf',20,'#000000',\whereof\ThinkImage\Image::IMAGE_WATER_SOUTHEAST)->save("new.jpg");

Recommended learning: "The latest 10 thinkphp video tutorials"

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