php - 如何使用codeigniter实现上传脚本

Question

我正在尝试向 codeigniter 实现多个文件上传脚本。该脚本可以在这里找到 http://valums.com/ajax-upload/ 。我觉得它很好，所以我决定放入当前的应用程序。

问题是，我无法使用 codeigniter 访问上传的文件。如果您是 codeigniter 开发人员，请告诉我如何获取脚本发送的文件？

Answer 1

CodeIgniter 有几种方法来处理上传，但由于您的 ajax 上传脚本已经有一个处理程序，因此您应该使用它。

如何:

在您的 application/libraries 文件夹中创建一个新文件，命名为 Qqfileuploader.php 并将其粘贴到其中:

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
    class Qqfileuploader {
        private $allowedExtensions = array();
        private $sizeLimit = 10485760;
        private $file;

        function __construct(array $allowedExtensions = array(), $sizeLimit = 10485760){        
            $allowedExtensions = array_map("strtolower", $allowedExtensions);

            $this->allowedExtensions = $allowedExtensions;        
            $this->sizeLimit = $sizeLimit;

            $this->checkServerSettings();       

            if (isset($_GET['qqfile'])) {
                $this->file = new qqUploadedFileXhr();
            } elseif (isset($_FILES['qqfile'])) {
                $this->file = new qqUploadedFileForm();
            } else {
                $this->file = false; 
            }
        }

        private function checkServerSettings(){        
            $postSize = $this->toBytes(ini_get('post_max_size'));
            $uploadSize = $this->toBytes(ini_get('upload_max_filesize'));        

            if ($postSize < $this->sizeLimit || $uploadSize < $this->sizeLimit){
                $size = max(1, $this->sizeLimit / 1024 / 1024) . 'M';             
                die("{'error':'increase post_max_size and upload_max_filesize to $size'}");    
            }        
        }

        private function toBytes($str){
            $val = trim($str);
            $last = strtolower($str[strlen($str)-1]);
            switch($last) {
                case 'g': $val *= 1024;
                case 'm': $val *= 1024;
                case 'k': $val *= 1024;        
            }
            return $val;
        }

        /**
         * Returns array('success'=>true) or array('error'=>'error message')
         */
        function handleUpload($uploadDirectory, $replaceOldFile = FALSE){
            if (!is_writable($uploadDirectory)){
                return array('error' => "Server error. Upload directory isn't writable.");
            }

            if (!$this->file){
                return array('error' => 'No files were uploaded.');
            }

            $size = $this->file->getSize();

            if ($size == 0) {
                return array('error' => 'File is empty');
            }

            if ($size > $this->sizeLimit) {
                return array('error' => 'File is too large');
            }

            $pathinfo = pathinfo($this->file->getName());
            $filename = $pathinfo['filename'];
            //$filename = md5(uniqid());
            $ext = $pathinfo['extension'];

            if($this->allowedExtensions && !in_array(strtolower($ext), $this->allowedExtensions)){
                $these = implode(', ', $this->allowedExtensions);
                return array('error' => 'File has an invalid extension, it should be one of '. $these . '.');
            }

            if(!$replaceOldFile){
                /// don't overwrite previous files that were uploaded
                while (file_exists($uploadDirectory . $filename . '.' . $ext)) {
                    $filename .= rand(10, 99);
                }
            }

            if ($this->file->save($uploadDirectory . $filename . '.' . $ext)){
                return array('success'=>true);
            } else {
                return array('error'=> 'Could not save uploaded file.' .
                    'The upload was cancelled, or server error encountered');
            }

        }    
    }

现在，在您要上传到的 Controller 中，执行以下操作:

// list of valid extensions, ex. array("jpeg", "xml", "bmp")
$allowedExtensions = array();
// max file size in bytes
$sizeLimit = 10 * 1024 * 1024;

$this->load->library("Qqfileuploader",array($allowedExtensions, $sizeLimit));
$this->Qqfileuploader->handleUpload('uploads/');
// to pass data through iframe you will need to encode all html tags
echo htmlspecialchars(json_encode($result), ENT_NOQUOTES);

这应该有效。