PHP file upload reference configuration and large file upload_PHP tutorial

PHP uses the super global variable array $_FILES to record file upload related information. Before uploading the php file, you can adjust it by adjusting

1.file_uploads=on/off
Whether to allow file upload via http
2.max_execution_time=30
Allow the maximum execution time of the script. If it exceeds this time, an error will be reported
3.memory_limit=50M
Set the maximum amount of memory that the script can allocate to prevent runaway scripts from occupying too much memory. This instruction only takes effect when the
--enable-memory-limit flag is set during compilation
4.upload_max_filesize=20M
The maximum size allowed for uploaded files. This command must be less than post_max_size
5.upload_tmp_dir
Temporary storage directory for uploaded files
6.post_max_size=30M
Allow the maximum size accepted by the post method
The contents of the $_FILES array are as follows: www.jbxue.com
$_FILES['myFile']['name'] The original name of the client's last file.
$_FILES['myFile']['type'] The MIME type of the file, which requires the browser to provide support for this information, such as "image/gif".
$_FILES['myFile']['size'] The size of the uploaded file, in bytes.
$_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'] Status 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.
After the file is uploaded, it is stored in the temporary directory by default. At this time, you must delete it from the temporary directory or move it to other places. If 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.

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