PHP file upload/download

Introduction: This is a detailed page for PHP file upload and download. It introduces PHP, related knowledge, skills, experience, and some PHP source code.

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1. php. ini configuration

; Resource limits; resource restrictions; maximum execution time of each script, in seconds; http://php.net/max-execution-time; note: this directive is hardcoded to 0 for the CLI sapimax_execution_time = 30; maximum amount of time each script may spend parsing request data. it's a good; idea to limit this time on productions servers in order to eliminate unexpectedly; long running scripts .; note: this directive is hardcoded to-1 for the cli sapi; default value:-1 (unlimited); development value: 60 (60 seconds); production value: 60 (60 seconds); http://php.net/max-input-timemax_input_time = 60; maximum input variable nesting level; http://php.net/max-input-nesting-level;max_input_nesting_level = 64; maximum amount of memory a script may consume (128 MB); http://php.net/memory-limitmemory_limit = 128 m
 

Max_execution_time the maximum time for each script page to complete the operation, in seconds. If it is-1, there is no limit

Max_input_time maximum time for processing request data on each script page, in seconds. If it is-1, there is no limit

Memory_limit maximum memory that a script page can consume

 
; Maximum size of post data that PHP will accept.; http://php.net/post-max-sizepost_max_size = 8 m
 

The maximum value that PHP can receive through form post, including all items in the form.

 
;;;;;;;;;;;;;;;;;File uploads ;;;;;;;;;;;;;;;;;; whether to allow HTTP file uploads .; http://php.net/file-uploadsfile_uploads = on; temporary directory for HTTP uploaded files (will use system default if not; specified ).; http://php.net/upload-tmp-dirupload_tmp_dir = "E:/Wamp/tmp"; maximum allowed size for uploaded files .; http://php.net/upload-max-filesizeupload_max_filesize = 2 m
 

Whether file_uploads allows HTTP upload. The default value is on, which is enabled without modification.

The temporary storage directory when the upload_tmp_dir file is uploaded. If not specified, the default Temporary Folder is used.

Upload_max_filesize maximum number of objects that can be uploaded

2. Set three conditions on the page.

(1) set the type attribute to file.

(2) enctype = "multipart/form-Data" of Form"

(3) method = "Post"

 
<Form action = "" method = "Post" enctype = "multipart/form-Data"> <input name = "FILENAME" type = "file"/> <input type =" submit "value =" enter "/> </form>
 

<Input type = "hidden" name = "max_file_size" value = "1024000"/>

We recommend that you add a hidden field to the upload form to allow the maximum number of bytes to be uploaded. When the file is uploaded larger than 1 MB, the error value in $ files will return 2

3. the bool move_uploaded_file (string filename, string destination) function is used by PHP to upload files.

The temporary file name of the File Uploaded By filename, that is, $ _ FILES [tmp_name]

New path and name saved after destination upload

Move_uploaded_file () only saves the file in another place. This is for security considerations.

Bool is_uploaded_file (string filename) determines whether the file is post-uploaded.

<? Phpheader ('content-type: text/html; charset = UTF-8 '); $ tmparr =$ _ FILES ['filename']; if ($ tmparr ['error'] = 0) {If (is_uploaded_file ($ tmparr ['tmp _ name']) {If (move_uploaded_file ($ tmparr ['tmp _ name'], $ tmparr ['name']) {echo "uploaded successfully ";} else {echo "<SCRIPT> alert ('file invalid '); history. go (-1); </SCRIPT> ";}} else {echo" <SCRIPT> alert ('invalid operation'); history. go (-1); </SCRIPT> ";}} else {echo" <SCRIPT> alert ('upload error, error type :". $ tmparr ['error ']. "'); History. Go (-1); </SCRIPT>" ;}?>
 

4. The most common method for downloading through the download link and using the header () function.

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