Question

我目前正在Wamp上使用Valum的File Uploader，到目前为止一切顺利。在上传者的php文件中，我通过从会话数据中读取将上传的文件保存到当前用户的文件夹中以获取当前用户。但是，每当我因某种未知原因调用它时，它就会创建一个新会话。我检查了cookie并返回了正确的会话。我还检查了session_id()，它也返回了正确的会话。但是，它总是出于某种原因创建一个新会话。我甚至使用session_id()函数明确设置了会话ID。但是，由于某些原因，这些都不起作用。它返回了正确的id，但它没有保存到正确的id。任何人都知道为什么会这样吗？

以下是修改后的Uploader.php代码。

<?php
//if (!empty($_COOKIE['PHPSESSID'])){
session_id($_COOKIE['PHPSESSID']);
session_start();
//}
if(isset($_SESSION['id'])){
/**
 * Handle file uploads via XMLHttpRequest
 */


class qqUploadedFileXhr {
    /**
     * Save the file to the specified path
     * @return boolean TRUE on success
     */
    function save($path) {    
        $input = fopen("php://input", "r");
        $temp = tmpfile();
        $realSize = stream_copy_to_stream($input, $temp);
        fclose($input);

        if ($realSize != $this->getSize()){            
            return false;
        }

        $target = fopen($path, "w");        
        fseek($temp, 0, SEEK_SET);
        stream_copy_to_stream($temp, $target);
        fclose($target);

        return true;
    }
    function getName() {
        return $_GET['qqfile'];
    }
    function getSize() {
        if (isset($_SERVER["CONTENT_LENGTH"])){
            return (int)$_SERVER["CONTENT_LENGTH"];            
        } else {
            throw new Exception('Getting content length is not supported.');
        }      
    }   
}

/**
 * Handle file uploads via regular form post (uses the $_FILES array)
 */
class qqUploadedFileForm {  
    /**
     * Save the file to the specified path
     * @return boolean TRUE on success
     */
    function save($path) {

        if(!move_uploaded_file($_FILES['qqfile']['tmp_name'], $path)){
            return false;
        }
        return true;
    }
    function getName() {
        return $_FILES['qqfile']['name'];
    }
    function getSize() {
        return $_FILES['qqfile']['size'];
    }
}

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 - Upload size: $uploadSize, postSize: $postSize, sizeLimit: $this->sizeLimit'}");    
        }        
    }

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

    }    
}

// list of valid extensions, ex. array("jpeg", "xml", "bmp")
$allowedExtensions = array();
// max file size in bytes
$sizeLimit = 8 * 1024 * 1024;

$uploader = new qqFileUploader($allowedExtensions, $sizeLimit);
$result = $uploader->handleUpload("../users/".$_SESSION['id']."/uploads/");
// to pass data through iframe you will need to encode all html tags
echo htmlspecialchars(json_encode($result), ENT_NOQUOTES);
}else{
    echo json_encode(array('error'=>session_id()));
    //echo '{"error":"You are not logged in. Please log in to upload files."}';
}
?>

更新我现在看到一些不寻常的东西。看起来它正在复制会话并留下旧的会话文件 - 就像session_regnerate_id()那样。但是，我的代码中没有任何内容。

Answer 1

我有同样的问题，在我的情况下插入这一行......

ini_set('session.use_strict_mode', 0);

...在session_start()解决之前......

php会话ID无缘无故地改变

1 个答案: