


PHP file upload class and detailed explanation (1/2)_PHP tutorial
The upload_tmp_dir parameter in the PHP tutorial configuration is compared. If the file is in this directory, then move_uploaded_file will perform the move operation. Moreover, this comparison is case-sensitive, and / is also different under Windows. When the PHP configuration file is parsed, a realpath function will be called. That is to say, before you move_uploaded_file,
must pair $file['tmp_name'] = realpath($file[' tmp_name']); realpath.
There is another situation that everyone should pay attention to, that is, if move_uploaded_file is configured as an inaccessible path, then no matter how you handle it, move_uploaded_file will never successfully move the file.
When uploading files, you cannot move files using the move_uploaded_file function, but you can use copy or rename.
I’ve been confused too. In the document, it is rather vague. It is the function move_uploaded_file, which adds a step to check whether the file was uploaded by http post.
The following I found a file upload class on the Internet
**File upload class**/
class upload_file
{
/**statement**/
var $upfile_type,$upfile_size,$upfile_name,$upfile;
var $d_alt,$extention_list,$ tmp,$arri;
var $datetime,$date;
var $filestr,$size,$ext,$check;
var $flash_directory,$extention,$file_path,$base_directory;
var $url; //Jump path after successful file upload;
function upload_file()
{
/**Constructor**/
$this->set_url(" index.php"); //Initialize the jump path after successful upload;
$this->set_extention(); //Initialize the extension list;
$this->set_size(50); // Initialize the kb limit of uploaded files;
$this->set_date(); ;set_base_directory("attachmentfile"); //Initialization file upload root directory name, can be modified! ;
}
/**File type**/
function set_file_type($upfile_type)
{
$this->upfile_type = $upfile_type; //Get the file type ;
}
/**Get file name**/
function set_file_name($upfile_name)
{
$this->upfile_name = $upfile_name; //Get the file name ;
}
/**Get file**/
function set_upfile($upfile)
{
$this->upfile = $upfile; //Get the file in The name of the temporary file stored on the server; upfile_size; //Get file size;
}
/**Get file size**/
function set_url($url)
{
$this->url = $ url; //Set the jump path after successfully uploading the file; ;extention = preg_replace('/.*.(.*[^.].*)*/iu','1',$this->upfile_name); //Get the file extension;
}
/**Set the jump path after successful file upload**/
function set_datetime()
{
$this->datetime = date("ymdhis"); //Generate file name by time;
}
/**Get file extension**/
function set_date()
{
$this->date = date("y-m-d"); //Generate directory by date Name;
}
/**Initialization allows uploadingSet file name**/
function set_extension()
{
$this->extension_list = "doc|xls|ppt |avi|txt|gif|jpg|jpeg|bmp|png"; //Extension name allowed to be uploaded by default;
}
/**Set directory name**/
function set_size($ size)
{
$this->size = $size; function set_base_directory($directory)
{
$this->base_directory = $directory; //Generate file storage root directory;
}
/**Initialize allowed upload file types**/
function set_flash_directory()
{
$this->flash_directory = $this->base_directory."/".$this->date; //Generate file storage subdirectory;
}
/**Set maximum upload kb limit**/
function showerror($errstr="Unknown error! "){
echo "";
exit();
}
/**Initialization file storage root directory**/
function go_to($str,$url)
{
echo "";
exit();
}/**If the root directory is not created, create the file storage directory**/
function mk_base_dir()
{
if (! file_exists($this->base_directory )){ //Check whether the root directory exists;
@mkdir($this->base_directory,0777); //Create if it does not exist;
}
}/* *If the subdirectory is not created, create the file storage directory**/
$this->file_path = $this->flash_directory."/".$this->datetime.".".$this->extension; //Generate complete file access path;
function mk_dir()
{
if (! file_exists($this->flash_directory)){ //Check whether the subdirectory exists;
@mkdir($this ->flash_directory,0777); //Create if does not exist;
}
}
/**Get the decomposed file types allowed to be uploaded in the form of an array**/
function get_compare_extention()
{
$this->ext = explode("|",$this->extention_list);//Use "|" to explode the default extension;
}
/**Check whether the extension is in violation* */
function check_extension()
{
for($i=0;each($this->ext);$i++) //Traverse the array;
{
if( $this->ext[$i] == strtolower($this->extension)) //Compare the file extension to see if it matches the default allowed extension;
{
$this->check = true; ".$this->extention_list." One of them! ");}
// Warning if not matched
}
/**Check whether the file size exceeds the standard**/
function check_size()
{
if($this-> ;upfile_size > round($this->size*1024)) //Whether the file size exceeds the default size;
{
$this->showerror("Uploaded attachments must not exceed".$ this->size."kb"); //Warn if exceeded;
}
}
/**Full file access path**/
function set_file_path()
{}
/**Upload file**/
function copy_file()
{
if(copy($this->upfile,$this->file_path)){ / /Upload file;
print $this->go_to("The file has been uploaded successfully!",$this->url); //Uploaded successfully;
}else {
print $this-> ;showerror("Unexpected error, please try again!"); //Upload failed;
}
}
/**Complete save**/
function save()
{
$this->set_flash_directory(); //Initialize the file upload subdirectory name;
$this->get_extention(); //Get the file extension;
$this-> get_compare_extention(); //Use "|" to decompose the default extension;
$this->check_extention(); //Detect whether the file extension is in violation;
$this->check_size(); / /Check whether the file size exceeds the limit;
$this->mk_base_dir(); //If the root directory does not exist, create it;
$this->mk_dir(); //If the subdirectory does not exist, then create;
1 2

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PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

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PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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