codeigniter教程之多文件上传使用示例_php实例

<?php if(!defined("BASEPATH")){ exit("No direct script access allowed"); }</P><P> /**<BR>  * Multi-Upload<BR>  * <BR>  * Extends CodeIgniters native Upload class to add support for multiple<BR>  * uploads.<BR>  *<BR>  * @package  CodeIgniter<BR>  * @subpackage Libraries<BR>  * @category Uploads<BR>  */<BR>  class MY_Upload extends CI_Upload {</P><P><BR>   /**<BR>    * Properties<BR>    */<BR>     protected $_multi_upload_data   = array();<BR>    protected $_multi_file_name_override = "";</P><P><BR>   /**<BR>    * Initialize preferences<BR>    *<BR>    * @access public<BR>    * @param array<BR>    * @return void<BR>    */<BR>    public function initialize($config = array()){<BR>     //Upload default settings.<BR>     $defaults = array(<BR>         "max_size"   => 0,<BR>         "max_width"   => 0,<BR>         "max_height"  => 0,<BR>         "max_filename"  => 0,<BR>         "allowed_types"  => "",<BR>         "file_temp"   => "",<BR>         "file_name"   => "",<BR>         "orig_name"   => "",<BR>         "file_type"   => "",<BR>         "file_size"   => "",<BR>         "file_ext"   => "",<BR>         "upload_path"  => "",<BR>         "overwrite"   => FALSE,<BR>         "encrypt_name"  => FALSE,<BR>         "is_image"   => FALSE,<BR>         "image_width"  => "",<BR>         "image_height"  => "",<BR>         "image_type"  => "",<BR>         "image_size_str" => "",<BR>         "error_msg"   => array(),<BR>         "mimes"    => array(),<BR>         "remove_spaces"  => TRUE,<BR>         "xss_clean"   => FALSE,<BR>         "temp_prefix"  => "temp_file_",<BR>         "client_name"  => ""<BR>        );</P><P>     //Set each configuration.<BR>     foreach($defaults as $key => $val){<BR>      if(isset($config[$key])){<BR>       $method = "set_{$key}";<BR>       if(method_exists($this, $method)){<BR>        $this->$method($config[$key]);<BR>       } else {<BR>        $this->$key = $config[$key];<BR>       }<BR>      } else {<BR>       $this->$key = $val;<BR>      }<BR>     }</P><P>     //Check if file_name was provided.<BR>     if(!empty($this->file_name)){<BR>      //Multiple file upload.<BR>      if(is_array($this->file_name)){<BR>       //Clear file name override.<BR>       $this->_file_name_override = "";</P><P>       //Set multiple file name override.<BR>       $this->_multi_file_name_override = $this->file_name;<BR>      //Single file upload.<BR>      } else {<BR>       //Set file name override.<BR>       $this->_file_name_override = $this->file_name;</P><P>       //Clear multiple file name override.<BR>       $this->_multi_file_name_override = "";<BR>      }<BR>     }<BR>    }</P><P><BR>   /**<BR>    * File MIME Type<BR>    * <BR>    * Detects the (actual) MIME type of the uploaded file, if possible.<BR>    * The input array is expected to be $_FILES[$field].<BR>    * <BR>    * In the case of multiple uploads, a optional second argument may be<BR>    * passed specifying which array element of the $_FILES[$field] array<BR>    * elements should be referenced (name, type, tmp_name, etc).<BR>    *<BR>    * @access protected<BR>    * @param $file array<BR>    * @param $count int<BR>    * @return void<BR>    */<BR>    protected function _file_mime_type($file, $count=0){<BR>     //Mutliple file?<BR>     if(is_array($file["name"])){<BR>      $tmp_name = $file["tmp_name"][$count];<BR>      $type = $file["type"][$count];<BR>     //Single file.<BR>     } else {<BR>      $tmp_name = $file["tmp_name"];<BR>      $type = $file["type"];<BR>     }</P><P>     //We'll need this to validate the MIME info string (e.g. text/plain; charset=us-ascii).<BR>     $regexp = "/^([a-z\-]+\/[a-z0-9\-\.\+]+)(;\s.+)?$/";</P><P>     /* Fileinfo Extension - most reliable method.<BR>      * <BR>      * Unfortunately, prior to PHP 5.3 - it's only available as a PECL extension and the<BR>      * more convenient FILEINFO_MIME_TYPE flag doesn't exist.<BR>      */<BR>       if(function_exists("finfo_file")){<BR>        $finfo = finfo_open(FILEINFO_MIME);<BR>       if(is_resource($finfo)){<BR>        $mime = @finfo_file($finfo, $tmp_name);<BR>        finfo_close($finfo);</P><P>        /* According to the comments section of the PHP manual page,<BR>         * it is possible that this function returns an empty string<BR>         * for some files (e.g. if they don't exist in the magic MIME database).<BR>         */<BR>          if(is_string($mime) && preg_match($regexp, $mime, $matches)){<BR>           $this->file_type = $matches[1];<BR>          return;<BR>          }<BR>       }<BR>       }</P><P>     /* This is an ugly hack, but UNIX-type systems provide a "native" way to detect the file type,<BR>      * which is still more secure than depending on the value of $_FILES[$field]['type'], and as it<BR>      * was reported in issue #750 (https://github.com/EllisLab/CodeIgniter/issues/750) - it's better<BR>      * than mime_content_type() as well, hence the attempts to try calling the command line with<BR>      * three different functions.<BR>      *<BR>      * Notes:<BR>      * - the DIRECTORY_SEPARATOR comparison ensures that we're not on a Windows system<BR>      * - many system admins would disable the exec(), shell_exec(), popen() and similar functions<BR>      *   due to security concerns, hence the function_exists() checks<BR>      */<BR>       if(DIRECTORY_SEPARATOR !== "\\"){<BR>        $cmd = "file --brief --mime ".escapeshellarg($tmp_name)." 2>&1";</P><P>       if(function_exists("exec")){<BR>        /* This might look confusing, as $mime is being populated with all of the output when set in the second parameter.<BR>         * However, we only neeed the last line, which is the actual return value of exec(), and as such - it overwrites<BR>         * anything that could already be set for $mime previously. This effectively makes the second parameter a dummy<BR>         * value, which is only put to allow us to get the return status code.<BR>         */<BR>         $mime = @exec($cmd, $mime, $return_status);<BR>         if($return_status === 0 && is_string($mime) && preg_match($regexp, $mime, $matches)){<BR>          $this->file_type = $matches[1];<BR>          return;<BR>         }<BR>       }<BR>       }</P><P>      if((bool)@ini_get("safe_mode") === FALSE && function_exists("shell_exec")){<BR>       $mime = @shell_exec($cmd);<BR>       if(strlen($mime) > 0){<BR>        $mime = explode("\n", trim($mime));<BR>        if(preg_match($regexp, $mime[(count($mime) - 1)], $matches)){<BR>         $this->file_type = $matches[1];<BR>         return;<BR>        }<BR>       }<BR>      }</P><P>      if(function_exists("popen")){<BR>       $proc = @popen($cmd, "r");<BR>       if(is_resource($proc)){<BR>        $mime = @fread($proc, 512);<BR>        @pclose($proc);<BR>        if($mime !== FALSE){<BR>         $mime = explode("\n", trim($mime));<BR>         if(preg_match($regexp, $mime[(count($mime) - 1)], $matches)){<BR>          $this->file_type = $matches[1];<BR>          return;<BR>         }<BR>        }<BR>       }<BR>      }</P><P>      //Fall back to the deprecated mime_content_type(), if available (still better than $_FILES[$field]["type"])<BR>      if(function_exists("mime_content_type")){<BR>       $this->file_type = @mime_content_type($tmp_name);<BR>       //It's possible that mime_content_type() returns FALSE or an empty string.<BR>       if(strlen($this->file_type) > 0){<BR>        return;<BR>       }<BR>      }</P><P>      //If all else fails, use $_FILES default mime type.<BR>      $this->file_type = $type;<BR>    }</P><P><BR>   /**<BR>    * Set Multiple Upload Data<BR>    *<BR>    * @access protected<BR>    * @return void<BR>    */<BR>    protected function set_multi_upload_data(){<BR>     $this->_multi_upload_data[] = array(<BR>      "file_name"   => $this->file_name,<BR>      "file_type"   => $this->file_type,<BR>      "file_path"   => $this->upload_path,<BR>      "full_path"   => $this->upload_path.$this->file_name,<BR>      "raw_name"   => str_replace($this->file_ext, "", $this->file_name),<BR>      "orig_name"   => $this->orig_name,<BR>      "client_name"  => $this->client_name,<BR>      "file_ext"   => $this->file_ext,<BR>      "file_size"   => $this->file_size,<BR>      "is_image"   => $this->is_image(),<BR>      "image_width"  => $this->image_width,<BR>      "image_height"  => $this->image_height,<BR>      "image_type"  => $this->image_type,<BR>      "image_size_str" => $this->image_size_str<BR>     );<BR>    }</P><P><BR>   /**<BR>    * Get Multiple Upload Data<BR>    *<BR>    * @access public<BR>    * @return array<BR>    */<BR>    public function get_multi_upload_data(){<BR>     return $this->_multi_upload_data;<BR>    }</P><P><BR>   /**<BR>    * Multile File Upload<BR>    *<BR>    * @access public<BR>    * @param string<BR>    * @return mixed<BR>    */<BR>    public function do_multi_upload($field){<BR>     //Is $_FILES[$field] set? If not, no reason to continue.<BR>     if(!isset($_FILES[$field])){ return false; }</P><P>     //Is this really a multi upload?<BR>     if(!is_array($_FILES[$field]["name"])){<BR>      //Fallback to do_upload method.<BR>      return $this->do_upload($field);<BR>     }</P><P>     //Is the upload path valid?<BR>     if(!$this->validate_upload_path()){<BR>      //Errors will already be set by validate_upload_path() so just return FALSE<BR>      return FALSE;<BR>     }</P><P>     //Every file will have a separate entry in each of the $_FILES associative array elements (name, type, etc).<BR>     //Loop through $_FILES[$field]["name"] as representative of total number of files. Use count as key in<BR>     //corresponding elements of the $_FILES[$field] elements.<BR>     for($i=0; $i<count($_FILES[$field]["name"]); $i++){<BR>      //Was the file able to be uploaded? If not, determine the reason why.<BR>      if(!is_uploaded_file($_FILES[$field]["tmp_name"][$i])){<BR>       //Determine error number.<BR>       $error = (!isset($_FILES[$field]["error"][$i])) ? 4 : $_FILES[$field]["error"][$i];</P><P>       //Set error.<BR>       switch($error){<BR>        //UPLOAD_ERR_INI_SIZE<BR>        case 1:<BR>         $this->set_error("upload_file_exceeds_limit");<BR>        break;<BR>        //UPLOAD_ERR_FORM_SIZE<BR>        case 2:<BR>         $this->set_error("upload_file_exceeds_form_limit");<BR>        break;<BR>        //UPLOAD_ERR_PARTIAL<BR>        case 3:<BR>         $this->set_error("upload_file_partial");<BR>        break;<BR>        //UPLOAD_ERR_NO_FILE<BR>        case 4:<BR>         $this->set_error("upload_no_file_selected");<BR>        break;<BR>        //UPLOAD_ERR_NO_TMP_DIR<BR>        case 6:<BR>         $this->set_error("upload_no_temp_directory");<BR>        break;<BR>        //UPLOAD_ERR_CANT_WRITE<BR>        case 7:<BR>         $this->set_error("upload_unable_to_write_file");<BR>        break;<BR>        //UPLOAD_ERR_EXTENSION<BR>        case 8:<BR>         $this->set_error("upload_stopped_by_extension");<BR>        break;<BR>        default:<BR>         $this->set_error("upload_no_file_selected");<BR>        break;<BR>       }</P><P>       //Return failed upload.<BR>       return FALSE;<BR>      }</P><P>      //Set current file data as class variables.<BR>      $this->file_temp = $_FILES[$field]["tmp_name"][$i];<BR>      $this->file_size = $_FILES[$field]["size"][$i];<BR>      $this->_file_mime_type($_FILES[$field], $i);<BR>      $this->file_type = preg_replace("/^(.+?);.*$/", "\\1", $this->file_type);<BR>      $this->file_type = strtolower(trim(stripslashes($this->file_type), '"'));<BR>      $this->file_name = $this->_prep_filename($_FILES[$field]["name"][$i]);<BR>      $this->file_ext  = $this->get_extension($this->file_name);<BR>      $this->client_name = $this->file_name;</P><P>      //Is the file type allowed to be uploaded?<BR>      if(!$this->is_allowed_filetype()){<BR>       $this->set_error("upload_invalid_filetype");<BR>       return FALSE;<BR>      }</P><P>      //If we're overriding, let's now make sure the new name and type is allowed.<BR>      //Check if a filename was supplied for the current file. Otherwise, use it's given name.<BR>      if(!empty($this->_multi_file_name_override[$i])){<BR>       $this->file_name = $this->_prep_filename($this->_multi_file_name_override[$i]);</P><P>       //If no extension was provided in the file_name config item, use the uploaded one.<BR>       if(strpos($this->_multi_file_name_override[$i], ".") === FALSE){<BR>        $this->file_name .= $this->file_ext;<BR>       //An extension was provided, lets have it!<BR>       } else {<BR>        $this->file_ext = $this->get_extension($this->_multi_file_name_override[$i]);<BR>       }</P><P>       if(!$this->is_allowed_filetype(TRUE)){<BR>        $this->set_error("upload_invalid_filetype");<BR>        return FALSE;<BR>       }<BR>      }</P><P>      //Convert the file size to kilobytes.<BR>      if($this->file_size > 0){<BR>       $this->file_size = round($this->file_size/1024, 2);<BR>      }</P><P>      //Is the file size within the allowed maximum?<BR>      if(!$this->is_allowed_filesize()){<BR>       $this->set_error("upload_invalid_filesize");<BR>       return FALSE;<BR>      }</P><P>      //Are the image dimensions within the allowed size?<BR>      //Note: This can fail if the server has an open_basdir restriction.<BR>      if(!$this->is_allowed_dimensions()){<BR>       $this->set_error("upload_invalid_dimensions");<BR>       return FALSE;<BR>      }</P><P>      //Sanitize the file name for security.<BR>      $this->file_name = $this->clean_file_name($this->file_name);</P><P>      //Truncate the file name if it's too long<BR>      if($this->max_filename > 0){<BR>       $this->file_name = $this->limit_filename_length($this->file_name, $this->max_filename);<BR>      }</P><P>      //Remove white spaces in the name<BR>      if($this->remove_spaces == TRUE){<BR>       $this->file_name = preg_replace("/\s+/", "_", $this->file_name);<BR>      }</P><P>      /* Validate the file name<BR>       * This function appends an number onto the end of<BR>       * the file if one with the same name already exists.<BR>       * If it returns false there was a problem.<BR>       */<BR>       $this->orig_name = $this->file_name;<BR>       if($this->overwrite == FALSE){<BR>        $this->file_name = $this->set_filename($this->upload_path, $this->file_name);<BR>        if($this->file_name === FALSE){<BR>         return FALSE;<BR>        }<BR>       }</P><P>      /* Run the file through the XSS hacking filter<BR>       * This helps prevent malicious code from being<BR>       * embedded within a file.  Scripts can easily<BR>       * be disguised as images or other file types.<BR>       */<BR>       if($this->xss_clean){<BR>        if($this->do_xss_clean() === FALSE){<BR>         $this->set_error("upload_unable_to_write_file");<BR>         return FALSE;<BR>        }<BR>       }</P><P>      /* Move the file to the final destination<BR>       * To deal with different server configurations<BR>       * we'll attempt to use copy() first.  If that fails<BR>       * we'll use move_uploaded_file().  One of the two sho<div>）本文来源gaodai.ma#com搞#代!码网_</div><strong>搞代gaodaima码</strong>uld<BR>       * reliably work in most environments<BR>       */<BR>       if(!@copy($this->file_temp, $this->upload_path.$this->file_name)){<BR>        if(!@move_uploaded_file($this->file_temp, $this->upload_path.$this->file_name)){<BR>         $this->set_error("upload_destination_error");<BR>         return FALSE;<BR>        }<BR>       }</P><P>      /* Set the finalized image dimensions<BR>       * This sets the image width/height (assuming the<BR>       * file was an image).  We use this information<BR>       * in the "data" function.<BR>       */<BR>       $this->set_image_properties($this->upload_path.$this->file_name);</P><P>      //Set current file data to multi_file_upload_data.<BR>      $this->set_multi_upload_data();<BR>     }</P><P>     //Return all file upload data.<BR>     return TRUE;<BR>   }<BR>  }<BR>

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