An analysis of the methods of uploading files in PHP

Copy Code Attention: tag, the file upload must be specified as Multipart/form-data. Also, note the hidden value of the form option max_file_size in file upload.html, which limits the size of the uploaded file by setting its value. The value of max_file_size is just a suggestion to the browser, in fact it can be simply bypassed. The maximum number of uploaded files in PHP settings is not invalidated. However, it is best to add max_file_size to the form to improve the upload experience. 2,upload.php $f =& $HTTP _post_files[' Myfile '; $dest _dir= ' uploads '; Set upload Directory $dest = $dest _dir. '/'. Date ("Ymd"). " _ ". $f [' name ']; Set file name to date plus file name to avoid duplication $r =move_uploaded_file ($f [' Tmp_name '], $dest); chmod ($dest, 0755); Set the properties of the uploaded file Or Copy Code In the above example, the contents of the $_files array are as follows. Assume that the File upload field has the name UserFile (name is optionally named) $_files[' UserFile ' [' Name '] The original name of the client machine file. The MIME type of the $_files[' userfile ' [' type '] file requires the browser to provide support for that information, such as "Image/gif". $_files[' userfile ' [' size '] the size of the uploaded file, in bytes. $_files[' UserFile '] [' tmp_name '] files are uploaded after the temporary file name stored on the server. $_files[' userfile ' [' Error '] and the file upload related error code value: 0; No error occurred and the file upload was successful. Value: 1; The uploaded file exceeds the value of the Upload_max_filesize option limit in php.ini. Value: 2; The size of the uploaded file exceeds the value specified by the Max_file_size option in the HTML form. Value: 3; Only part of the file is uploaded. Value: 4; No files were uploaded.

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