PHP圖片上傳中間失敗。上傳了一半圖片

Question

如何檢測圖片是否已完全上傳或部分上傳？我遇到了一個奇怪的情況，只上傳了一半圖片。下面的圖像通過一個Web服務，通​​過Android應用程序上傳用戶：

管理門戶和Web服務使用Yii框架編寫的。什麼可能導致像這樣創建圖像？ Android開發者發送base-64編碼串和我對其進行解碼的方式如下：

$profilePicture = $data['profilePicture']; 
    header('Content-Type: image/png'); 
    $rnd = sprintf('%04d', rand(0, 9999)); 
    $fileName = $rnd . '_' . time() . '.png'; // random number + timestamp 

    $uploadPath = User::getProfilePicturePath() . $id; 

    if (!file_exists($uploadPath) and ! is_dir($uploadPath)) //create a directory only if it does not exist. 
     mkdir($uploadPath); 

    if (!file_put_contents($uploadPath . DIRECTORY_SEPARATOR . $fileName, base64_decode($profilePicture))) 

我懷疑這是原因，因爲Android開發者正在發送的基64編碼之前文件被完全上傳。或者是別的什麼？

$ profilePicture等於64鹼基串這樣，

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 

的Android端代碼如下，

String imageString = Base64.encodeBytes(byteImage); 

這是所使用的類文件。

http://www.mirthcorp.com/community/issues/secure/attachment/10313/Base64.java

Answer 1

可以使用imagecreatefrompng函數來檢查提供的圖像是否損壞。

$src1 = 'F:\Test\0374_1423730003.png'; 
$src2 = 'F:\Test\5030_1423722865.png'; // broken 

$im = @imagecreatefrompng($src1); 
if ($im) 
    echo 'created img'; 
else 
    echo 'not created, broken image'; 

Answer 2

public String BitMapToString(Bitmap bitmap){ 

        ByteArrayOutputStream baos=new  ByteArrayOutputStream(); 

        bitmap.compress(Bitmap.CompressFormat.JPEG,100, baos); 

        byte [] b=baos.toByteArray(); 

        String temp=null; 

        try{ 

            System.gc(); 

            temp= Base64.encodeToString(b, Base64.DEFAULT); 

        }catch(Exception e){ 

            e.printStackTrace(); 

        }catch(OutOfMemoryError e){ 

            baos=new  ByteArrayOutputStream(); 

            bitmap.compress(Bitmap.CompressFormat.JPEG,50, baos); 
            b=baos.toByteArray(); 

            temp=Base64.encodeToString(b, Base64.DEFAULT); 

            Log.e("EWN", "Out of memory error catched"); 

        } 

        return temp; 

    } 

這種方法可以幫助你的位圖圖像轉換爲Base64編碼字符串。