PHP $

Such as:
Copy CodeThe code is as follows:
<form enctype= "Multipart/form-data" action= "upload.php" method= "POST" >
<input type= "hidden" name= "max_file_size" value= "1000" >
<input name= "MyFile" type= "File" >
<input type= "Submit" value= "Upload file" >
</form>

Then the upload.php can be used directly
$_files
$_post
$_get
Functions to get the contents of the form.

Today we focus on the $_files function.
When the client commits, we get a $_files array

The $_files array reads as follows:
$_files[the original name of the ' MyFile ' [' name '] client file.
The MIME type of the $_files[' myFile ' [' type '] file requires the browser to provide support for that information, such as "Image/gif".
$_files[' myFile ' [' size '] the size of the uploaded file, in bytes.
$_files[' myFile ' [' tmp_name '] files are stored in the server after the temporary file name, typically the system default. Can be specified in the php.ini upload_tmp_dir, but the putenv () function setting does not work.
$_files[' myFile ' [' Error '] and the file upload related error code. [' ERROR '] is added in PHP version 4.2.0. Here's what it says: (They're constant after PHP3.0)
Upload_err_ok
Value: 0; No error occurred, file upload succeeded.
Upload_err_ini_size
Value: 1; The uploaded file exceeds the value of the Upload_max_filesize option limit in php.ini.
Upload_err_form_size
Value: 2; The size of the upload file exceeds the value specified by the Max_file_size option in the HTML form.
Upload_err_partial
Value: 3; The file is only partially uploaded.
Upload_err_no_file
Value: 4; No files were uploaded.
Value: 5; The upload file size is 0.

When the file is uploaded, it is stored in the temporary directory by default, and you must remove it from the temporary directory or move it to another location, if not, it will be deleted. That is, whether or not the upload succeeds, the files in the temp directory will be deleted after the script is executed. So before you delete it, copy it to another location using PHP's copy () function, which completes the upload file process.