A brief introduction to the principle of php file upload

PHP file uploadThe principle is simply analyzed. Friends who learn PHP can refer to it. It is indeed much simpler than asp.

//Form uploads can only use the multipart/form-data encoding format
$_FILES systemFunction;
$_FILES['myFile']['name'] file Name
$_FILES['myFile']['type']The type of file, restricted by the server
image/**
image/x-png
application/x-zip-compressed
$_FILES['myFile']['size']Upload file size
$_FILES['myFile']['tmp_name']Save the temporary file name after uploading to the service
$_FILES['myFile'][ 'error'] Error code;
0 Success 1 Exceeds the php.ini size 2 Exceeds the value specified by the MAX_FILE_SIZE option
3 Only partially uploaded 5 The uploaded file size is 0

move_uploaded_file(temporary file, target location and file name);
Function to move the file to the target location after uploading
is_uploaded_file(MIME);
Function to determine the uploaded MIME type of the file

The code is as follows:

  
 if(is_uploaded_file($_FILES['myFile']['tmp_name'])){ $upfile = $_FILES['upload']； $name = $upfile['name']; $type = $upfile['type']; $size = $upfile['size']; $tmp_name = $upfile['tmp_name']; $error = $upfile['error']; switch($type){ case 'image/pjpeg' : $ok=1; break } if($ok){ move_uploaded_file($tmp_name,'up/'.$name); }else{ echo "文件类型不允许"; } }

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