Detailed interpretation of the contents of the PHP $_FILES array_PHP tutorial

For first time contactThe contents of the PHP $_FILES array are as follows:

$_FILES['myFile']['name'] The original name of the client file.
$_FILES['myFile']['type'] The MIME type of the file, which requires the browser to support this information, such as "image/gif".
$_FILES['myFile']['size'] c.
$_FILES['myFile']['tmp_name'] The temporary file name stored on the server after the file is uploaded, usually the system default. It can be specified in upload_tmp_dir in php.ini, but setting it with the putenv() function has no effect.
$_FILES['myFile']['error'] The error code related to the file upload. ['error'] was added in PHP 4.2.0. The following is its description: (They became constants after PHP3.0)

UPLOAD_ERR_OK
Value: 0; No error occurred and the file was uploaded successfully.
UPLOAD_ERR_INI_SIZE
Value: 1; The uploaded file exceeds the value limited by the upload_max_filesize option in php.ini.
UPLOAD_ERR_FORM_SIZE
Value: 2; The size of the uploaded file exceeds the value specified by the MAX_FILE_SIZE option in the HTML form.

UPLOAD_ERR_PARTIAL
Value: 3; Only part of the file was uploaded.
UPLOAD_ERR_NO_FILE
Value: 4; No file was uploaded.
Value: 5; The uploaded file size is 0.

Use the PHP $_FILES array to upload the file. After the file is uploaded, it is stored in the temporary directory by default. At this time, you must remove it from the temporary directory. Delete or move it elsewhere, or if not, it will be deleted. That is, regardless of whether the upload is successful or not, the files in the temporary directory will definitely be deleted after the script is executed. Therefore, you need to use PHP's copy() function to copy it to another location before deleting it. At this time, the file upload process is completed.