Understand how php files are uploaded

Understand how php files are uploaded

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 "file type not allowed "; } } ?> Principle analysis: // form Upload can only use multipart/form-data encoding format $ _ FILES system functions; $ _ FILES ['myfile'] ['name'] file name $ _ FILES ['myfile'] ['type'] file type, the server restricts image/** image/x-pngapplication/x-zip-compressed $ _ FILES ['myfile'] ['size'] Upload File size $ _ FILES ['myfile '] ['tmp _ name'] Save the temporary file name after uploading the service $ _ FILES ['myfile'] ['error'] error code; 0 Success 1 exceeds php. ini size 2 exceeds the value specified by the MAX_FILE_SIZE option. 3. only part of the file is uploaded. 5. the size of the uploaded file is 0. Move_uploaded_file (temporary file, target location and file name); function is_uploaded_file (MIME) for moving the file to the target location after Upload; function for determining the Uploaded MIME type File