How to upload files in thinkphp

Thinkphp is a very popular PHP development framework. It provides many excellent tools and functions, making web application development more efficient and simpler. Among them, the file upload function is a function that is often used in website development. This article will introduce how to implement file upload in Thinkphp.

1. Prerequisites

Before you start using the upload function, you need to ensure that the php.ini file has been configured correctly. Specifically, the following two parameters need to be configured correctly:

file_uploads = On        // 允许上传文件
upload_max_filesize = 2M  // 允许上传最大的文件大小为2M

If these two parameters are not configured properly, the upload will fail or large files cannot be uploaded.

2. Page design

First, you need to design a form on the page so that users can upload files. In the html code, you can add the following form:

< form method="post" action="__URL__" enctype="multipart/form-data">
      <input type="file" name="image"/>
      <input type="submit" name="submit" value="上传"/>
< /form>

Among them, enctype="multipart/form-data" is required because this attribute can ensure that the form can upload files correctly.

3. Controller

In Thinkphp, the controller is used to receive data in the form, including uploaded file information. In the controller, you can use the Request class to receive form data and files, like this:

public function upload() {
      $file = request()->file('image');
      
      if ($file) {
          // 处理上传的文件
      } else {
          // 文件上传失败
      }
}

In the above code, we use the request() function to receive files in the form. If the file is uploaded successfully, it will enter the if statement block.

4. File processing

When the file is uploaded successfully, we need to process the uploaded file. Here is a simple example to save the uploaded image to the specified folder:

public function upload() {
      $file = request()->file('image');
      
      if ($file) {
          // 处理上传的文件
          $info = $file->move(ROOT_PATH . 'public' . DS . 'uploads');
          
          if ($info) {
              // 保存文件成功
              echo $info->getSaveName();
          } else {
              // 保存文件失败
              echo $file->getError();
          }
      } else {
          // 文件上传失败
          echo "没有上传文件！";
      }
}

In the above code, we use the move function to save the file to the folder we specify. If the save is successful, the path to the file will be output. If saving fails, an error message will be output.

5. Conclusion

Through the above steps, we can implement the file upload function in Thinkphp. Of course, this is just a simple example. The process of uploading files also involves issues such as security and performance, which need to be improved according to the actual situation.

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