Introduction of $_ FILES array in PHP
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The PHP $_ FILES array is as follows:
$_ FILES ['myFile'] [' name'] the original name of the client file.
The MIME type of the $FILES ['myFile'] [' type'] file, which requires the browser to provide support for this information, such as "image/gif".
$_ FILES ['myFile'] [' size'] c.
The temporary file name stored on the server after the $_ FILES ['myFile'] [' tmp_name'] file is uploaded, which is generally the system default. It can be specified in the upload_tmp_dir of php.ini, but setting it with the putenv () function does not work.
$_ FILES ['myFile'] [' error'] and the error code associated with the file upload. ['error'] is added in PHP version 4.2.0. Here is its description: (they become 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 limit of the upload_max_filesize option in php.ini.
UPLOAD_ERR_FORM_SIZE
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 is uploaded.
UPLOAD_ERR_NO_FILE
Value: 4; No files have been uploaded.
Value: 5; upload file size is 0.
After uploading a file using the PHP $_ FILES array, it is stored in a temporary directory by default, and you must delete it from the temporary directory or move it somewhere else. If not, it will be deleted. That is, regardless of whether the upload is successful or not, the files in the temporary directory will be deleted after the script is executed. So before deleting it, use the copy () function of PHP to copy it to another location, at this point, the upload process is complete.
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