PHP File Upload

The receipt parameters of the form can be obtained by using an array of $_get or $_post, but the file field, although shown to be post, must use the $_files.

Differences between 1.$_get ($HTTP _get_vars) and $_post ($HTTP _post_vars)

2.$_files uploading and receiving files

2.1 Issues that you may encounter when uploading files

What are the keys of 2.2$_files

Name, type, size, tmp_name

2.3is_uploaded_file () method

2.4move_uploaded_file () method

------------------------------------------------------

Issues that you may encounter when uploading files

Note: The resulting file is too large to handle

Workaround 1: Remove the hard limit and change the upload_max_filesize option in php.ini to 2 megabytes or more for the length of the uploaded file

Workaround 2: Submit a parameter named Upload_max_filesize before the file field is submitted, then PHP will use that value as a soft limit for file size.

2.2 Key value of $_files

1.name the file name provided by the browser.

2.type the MIME type of the uploaded file.

3.size the size (in bytes) of the uploaded file.

4.tmp_name a temporary file name for uploading files in the server.

-----------------------------------------------------------

Form processing

Is_uploaded_file () method

Format:

if (Is_uploaded_file ($_files[' toprocess ' [' tmp_name ']))

{

Upload successful

}

Detects if a file has been successfully uploaded

Is_uploaded_file ($_files[' toprocess ' [' Tmp_name '], "path/to/put/file/$file")

/Move the uploaded file from the Temp folder to the specified directory, and when this method is called, the file is automatically detected for upload.

PHP File Upload