How thinkphp outputs pictures

ThinkPHP is a popular PHP framework, in which outputting pictures is also a very common function. Today we will discuss how to output images in ThinkPHP.

1. Output pictures through HTML tags

In ThinkPHP, we can use HTML to output pictures. We can specify the image path by using the src attribute of the img tag in the template file and output the content of the image to the browser.

<img  src="/static/imghwm/default1.png" data-src="http://www.example.com/image.jpg" class="lazy" alt="How thinkphp outputs pictures" >

Note that this method is only suitable for outputting external pictures and cannot be used to output internal pictures.

2. Output pictures through PHP code

If you want to output internal pictures, or want to more flexibly control the way of outputting pictures, we can use PHP code to output pictures . Below is a simple code example.

public function showImage()
{
    $path = './uploads/image.jpg';
    header('Content-type: image/jpeg');
    readfile($path);
}

In this example, we first specify the path of the image to be output, and then set the Content-Type header to "image/jpeg", which will tell the browser that this is a JPEG format image. . Finally, we use the readfile function to output the image content to the browser.

3. Processing dynamic output images

If we need to dynamically generate images, such as allowing users to upload their own avatars to the website and adjust them to the corresponding size For output, we need to use more advanced techniques.

ThinkPHP provides a class called "Think\Image" to handle image processing and output. We can use this class to dynamically generate images and output them to the browser. The following is a basic example:

public function showImage()
{
    $image = new \Think\Image();
    $image->open('./uploads/image.jpg');
    $image->thumb(150, 150);
    $image->save();
    header('Content-type: image/jpeg');
    readfile($path);
}

In this example, we first open an image using the open method. We then use the thumb method to resize the image to 150x150 pixels and save the processed image. Finally, we use the readfile function to output the image content to the browser. It should be noted that we still need to specify Content-Type as "image/jpeg" in the header.

Summary

The above are the three methods of outputting images in ThinkPHP. You can choose different methods based on specific usage scenarios. Whether it is simply outputting external images, or dynamically generating and processing images, ThinkPHP has corresponding solutions.

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