下载时，Mysql blob图像没有尺寸

Question

I am storing a few images in MYSQL for security reasons. When I download the image the file downloads with the correct file size and name but no image is displayed. Also the image has no dimensions when I look at it's properties. I am using cakephp.

header("Content-type: ".$file['UploadFile']['file_extension']);
header("Content-Disposition: attachment; filename=\"".$file['UploadFile']['file_name']."\"");
header("Content-length: ".$file['UploadFile']['file_size']);



echo $file['UploadFile']['file_content'];

I save my image with the following code...

public function image_upload($fileName, $source, $extension, $file_size) {
     $this->loadModel('UploadFile');

     $content = addslashes(file_get_contents($source));

     $file_data = array('UploadFile' => array('title' => $fileName, 'file_content' => $content, 'file_name' => $fileName, 'file_extension' => $extension, 'file_size' => $file_size, 'file_type' => 'image-art'));

     $this->UploadFile->create();
     $this->UploadFile->save($file_data);

     $file_id = $this->UploadFile->id;
     return $file_id;
    }

Answer 1

They are few possible reasons you might be having such

A. Wrong content type .. you have Content-type: ".$file['UploadFile']['file_extension'] .. that is worng` in your code

Eg. Files extention formation is somthing like ".jpg" while the content type is image/jpeg

B. Your file might not be properly saved which must have lead to the corruption on such image

C. File must have been truncated during upload

D. $content = addslashes(file_get_contents($source)); .. Don't ever addslashes to images .. it would messthing up or get ready to stripslashes when you are loading the image

To know if your image is valid before you download you can run this code

$image = ImageCreateFromString($file['UploadFile']['file_content']);
if(!$image)
     Something is Wrong 

You can also use getimagesize to add additional validation

Edit 1

Prove of Concept

$image = ImageCreateFromString ( $file ['UploadFile'] ['file_content'] );
if ($image) {

    /**
     * Check If Height and Width is grater than 1
     */
    if (ImageSX ( $image ) > 1 && ImageSY ( $image ) > 1) {
        $extention = strtolower ( $file ['UploadFile'] ['file_extension'] );
        switch ($extention) {
            case "png" :
                header ( 'Content-Type: image/png' ); // This is just example
                imagepng ( $image );
                break;

            case "gif" :
                header ( 'Content-Type: image/gif' ); // This is just example
                imagegif ( $image );
                break;

            case "jpg" :
            case "jpeg" :
                header ( 'Content-Type: image/jpg' ); // This is just example
                imagejpeg ( $image );
                break;

            default :
                die ( "Unsupported Image" );
                break;

        }

    } else {
        die ( "Fake Image" );
    }
} else {
    die ( "Invalid Image -- Contains Errors" );
}}