codeigniter教程之多文件上传使用示例

代码如下:

/**
* Multi-Upload
*
* Extends CodeIgniters native Upload class to add support for multiple
* uploads.
*
* @package CodeIgniter
* @subpackage Libraries
* @category Uploads
*/
class MY_Upload extends CI_Upload {

/**
* Properties
*/
protected $_multi_upload_data = array();
protected $_multi_file_name_override = "";

/**
* Initialize preferences
*
* @access public
* @param array
* @return void
*/
public function initialize($cOnfig= array()){
//Upload default settings.
$defaults = array(
"max_size" => 0,
"max_width" => 0,
"max_height" => 0,
"max_filename" => 0,
"allowed_types" => "",
"file_temp" => "",
"file_name" => "",
"orig_name" => "",
"file_type" => "",
"file_size" => "",
"file_ext" => "",
"upload_path" => "",
"overwrite" => FALSE,
"encrypt_name" => FALSE,
"is_image" => FALSE,
"image_width" => "",
"image_height" => "",
"image_type" => "",
"image_size_str" => "",
"error_msg" => array(),
"mimes" => array(),
"remove_spaces" => TRUE,
"xss_clean" => FALSE,
"temp_prefix" => "temp_file_",
"client_name" => ""
);

//Set each configuration.
foreach($defaults as $key => $val){
if(isset($config[$key])){
$method = "set_{$key}";
if(method_exists($this, $method)){
$this->$method($config[$key]);
} else {
$this->$key = $config[$key];
}
} else {
$this->$key = $val;
}
}

//Check if file_name was provided.
if(!empty($this->file_name)){
//Multiple file upload.
if(is_array($this->file_name)){
//Clear file name override.
$this->_file_name_override = "";

//Set multiple file name override.
$this->_multi_file_name_override = $this->file_name;
//Single file upload.
} else {
//Set file name override.
$this->_file_name_override = $this->file_name;

//Clear multiple file name override.
$this->_multi_file_name_override = "";
}
}
}

/**
* File MIME Type
*
* Detects the (actual) MIME type of the uploaded file, if possible.
* The input array is expected to be $_FILES[$field].
*
* In the case of multiple uploads, a optional second argument may be
* passed specifying which array element of the $_FILES[$field] array
* elements should be referenced (name, type, tmp_name, etc).
*
* @access protected
* @param $file array
* @param $count int
* @return void
*/
protected function _file_mime_type($file, $count=0){
//Mutliple file?
if(is_array($file["name"])){
$tmp_name = $file["tmp_name"][$count];
$type = $file["type"][$count];
//Single file.
} else {
$tmp_name = $file["tmp_name"];
$type = $file["type"];
}

//We'll need this to validate the MIME info string (e.g. text/plain; charset=us-ascii).
$regexp = "/^([a-z\-]+\/[a-z0-9\-\.\+]+)(;\s.+)?$/";

/* Fileinfo Extension - most reliable method.
*
* Unfortunately, prior to PHP 5.3 - it's only available as a PECL extension and the
* more convenient FILEINFO_MIME_TYPE flag doesn't exist.
*/
if(function_exists("finfo_file")){
$finfo = finfo_open(FILEINFO_MIME);
if(is_resource($finfo)){
$mime = @finfo_file($finfo, $tmp_name);
finfo_close($finfo);

/* According to the comments section of the PHP manual page,
* it is possible that this function returns an empty string
* for some files (e.g. if they don't exist in the magic MIME database).
*/
if(is_string($mime) && preg_match($regexp, $mime, $matches)){
$this->file_type = $matches[1];
return;
}
}
}

/* This is an ugly hack, but UNIX-type systems provide a "native" way to detect the file type,
* which is still more secure than depending on the value of $_FILES[$field]['type'], and as it
* was reported in issue #750 (https://github.com/EllisLab/CodeIgniter/issues/750) - it's better
* than mime_content_type() as well, hence the attempts to try calling the command line with
* three different functions.
*
* Notes:
* - the DIRECTORY_SEPARATOR comparison ensures that we're not on a Windows system
* - many system admins would disable the exec(), shell_exec(), popen() and similar functions
* due to security concerns, hence the function_exists() checks
*/
if(DIRECTORY_SEPARATOR !== "\\"){
$cmd = "file --brief --mime ".escapeshellarg($tmp_name)." 2>&1";

if(function_exists("exec")){
/* This might look confusing, as $mime is being populated with all of the output when set in the second parameter.
* However, we only neeed the last line, which is the actual return value of exec(), and as such - it overwrites
* anything that could already be set for $mime previously. This effectively makes the second parameter a dummy
* value, which is only put to allow us to get the return status code.
*/
$mime = @exec($cmd, $mime, $return_status);
if($return_status === 0 && is_string($mime) && preg_match($regexp, $mime, $matches)){
$this->file_type = $matches[1];
return;
}
}
}

if((bool)@ini_get("safe_mode") === FALSE && function_exists("shell_exec")){
$mime = @shell_exec($cmd);
if(strlen($mime) > 0){
$mime = explode("\n", trim($mime));
if(preg_match($regexp, $mime[(count($mime) - 1)], $matches)){
$this->file_type = $matches[1];
return;
}
}
}

if(function_exists("popen")){
$proc = @popen($cmd, "r");
if(is_resource($proc)){
$mime = @fread($proc, 512);
@pclose($proc);
if($mime !== FALSE){
$mime = explode("\n", trim($mime));
if(preg_match($regexp, $mime[(count($mime) - 1)], $matches)){
$this->file_type = $matches[1];
return;
}
}
}
}

//Fall back to the deprecated mime_content_type(), if available (still better than $_FILES[$field]["type"])
if(function_exists("mime_content_type")){
$this->file_type = @mime_content_type($tmp_name);
//It's possible that mime_content_type() returns FALSE or an empty string.
if(strlen($this->file_type) > 0){
return;
}
}

//If all else fails, use $_FILES default mime type.
$this->file_type = $type;
}

/**
* Set Multiple Upload Data
*
* @access protected
* @return void
*/
protected function set_multi_upload_data(){
$this->_multi_upload_data[] = array(
"file_name" => $this->file_name,
"file_type" => $this->file_type,
"file_path" => $this->upload_path,
"full_path" => $this->upload_path.$this->file_name,
"raw_name" => str_replace($this->file_ext, "", $this->file_name),
"orig_name" => $this->orig_name,
"client_name" => $this->client_name,
"file_ext" => $this->file_ext,
"file_size" => $this->file_size,
"is_image" => $this->is_image(),
"image_width" => $this->image_width,
"image_height" => $this->image_height,
"image_type" => $this->image_type,
"image_size_str" => $this->image_size_str
);
}

/**
* Get Multiple Upload Data
*
* @access public
* @return array
*/
public function get_multi_upload_data(){
return $this->_multi_upload_data;
}

/**
* Multile File Upload
*
* @access public
* @param string
* @return mixed
*/
public function do_multi_upload($field){
//Is $_FILES[$field] set? If not, no reason to continue.
if(!isset($_FILES[$field])){ return false; }

//Is this really a multi upload?
if(!is_array($_FILES[$field]["name"])){
//Fallback to do_upload method.
return $this->do_upload($field);
}

//Is the upload path valid?
if(!$this->validate_upload_path()){
//Errors will already be set by validate_upload_path() so just return FALSE
return FALSE;
}

//Every file will have a separate entry in each of the $_FILES associative array elements (name, type, etc).
//Loop through $_FILES[$field]["name"] as representative of total number of files. Use count as key in
//corresponding elements of the $_FILES[$field] elements.
for($i=0; $i //Was the file able to be uploaded? If not, determine the reason why.
if(!is_uploaded_file($_FILES[$field]["tmp_name"][$i])){
//Determine error number.
$error = (!isset($_FILES[$field]["error"][$i])) ? 4 : $_FILES[$field]["error"][$i];

//Set error.
switch($error){
//UPLOAD_ERR_INI_SIZE
case 1:
$this->set_error("upload_file_exceeds_limit");
break;
//UPLOAD_ERR_FORM_SIZE
case 2:
$this->set_error("upload_file_exceeds_form_limit");
break;
//UPLOAD_ERR_PARTIAL
case 3:
$this->set_error("upload_file_partial");
break;
//UPLOAD_ERR_NO_FILE
case 4:
$this->set_error("upload_no_file_selected");
break;
//UPLOAD_ERR_NO_TMP_DIR
case 6:
$this->set_error("upload_no_temp_directory");
break;
//UPLOAD_ERR_CANT_WRITE
case 7:
$this->set_error("upload_unable_to_write_file");
break;
//UPLOAD_ERR_EXTENSION
case 8:
$this->set_error("upload_stopped_by_extension");
break;
default:
$this->set_error("upload_no_file_selected");
break;
}

//Return failed upload.
return FALSE;
}

//Set current file data as class variables.
$this->file_temp = $_FILES[$field]["tmp_name"][$i];
$this->file_size = $_FILES[$field]["size"][$i];
$this->_file_mime_type($_FILES[$field], $i);
$this->file_type = preg_replace("/^(.+?);.*$/", "\\1", $this->file_type);
$this->file_type = strtolower(trim(stripslashes($this->file_type), '"'));
$this->file_name = $this->_prep_filename($_FILES[$field]["name"][$i]);
$this->file_ext = $this->get_extension($this->file_name);
$this->client_name = $this->file_name;

//Is the file type allowed to be uploaded?
if(!$this->is_allowed_filetype()){
$this->set_error("upload_invalid_filetype");
return FALSE;
}

//If we're overriding, let's now make sure the new name and type is allowed.
//Check if a filename was supplied for the current file. Otherwise, use it's given name.
if(!empty($this->_multi_file_name_override[$i])){
$this->file_name = $this->_prep_filename($this->_multi_file_name_override[$i]);

//If no extension was provided in the file_name config item, use the uploaded one.
if(strpos($this->_multi_file_name_override[$i], ".") === FALSE){
$this->file_name .= $this->file_ext;
//An extension was provided, lets have it!
} else {
$this->file_ext = $this->get_extension($this->_multi_file_name_override[$i]);
}

if(!$this->is_allowed_filetype(TRUE)){
$this->set_error("upload_invalid_filetype");
return FALSE;
}
}

//Convert the file size to kilobytes.
if($this->file_size > 0){
$this->file_size = round($this->file_size/1024, 2);
}

//Is the file size within the allowed maximum?
if(!$this->is_allowed_filesize()){
$this->set_error("upload_invalid_filesize");
return FALSE;
}

//Are the image dimensions within the allowed size?
//Note: This can fail if the server has an open_basdir restriction.
if(!$this->is_allowed_dimensions()){
$this->set_error("upload_invalid_dimensions");
return FALSE;
}

//Sanitize the file name for security.
$this->file_name = $this->clean_file_name($this->file_name);

//Truncate the file name if it's too long
if($this->max_filename > 0){
$this->file_name = $this->limit_filename_length($this->file_name, $this->max_filename);
}

//Remove white spaces in the name
if($this->remove_spaces == TRUE){
$this->file_name = preg_replace("/\s+/", "_", $this->file_name);
}

/* Validate the file name
* This function appends an number onto the end of
* the file if one with the same name already exists.
* If it returns false there was a problem.
*/
$this->orig_name = $this->file_name;
if($this->overwrite == FALSE){
$this->file_name = $this->set_filename($this->upload_path, $this->file_name);
if($this->file_name === FALSE){
return FALSE;
}
}

/* Run the file through the XSS hacking filter
* This helps prevent malicious code from being
* embedded within a file. Scripts can easily
* be disguised as images or other file types.
*/
if($this->xss_clean){
if($this->do_xss_clean() === FALSE){
$this->set_error("upload_unable_to_write_file");
return FALSE;
}
}

/* Move the file to the final destination
* To deal with different server configurations
* we'll attempt to use copy() first. If that fails
* we'll use move_uploaded_file(). One of the two should
* reliably work in most environments
*/
if(!@copy($this->file_temp, $this->upload_path.$this->file_name)){
if(!@move_uploaded_file($this->file_temp, $this->upload_path.$this->file_name)){
$this->set_error("upload_destination_error");
return FALSE;
}
}

/* Set the finalized image dimensions
* This sets the image width/height (assuming the
* file was an image). We use this information
* in the "data" function.
*/
$this->set_image_properties($this->upload_path.$this->file_name);

//Set current file data to multi_file_upload_data.
$this->set_multi_upload_data();
}

//Return all file upload data.
return TRUE;
}
}