為啥無法輸出一張圖片

來源:互聯網
上載者:User
為什麼無法輸出一張圖片
session_start();

//隨機碼的個數
//$_rnd_code = 4;

//建立隨機碼
for($i=0;$i<4;$i++){
$_nmsg.=dechex(mt_rand(0,15));
}

//儲存session
$_SESSION['code']=$_nmsg;

//長和高
$_width = 75;
$_height = 25;

//建立一張映像
$_img = imagecreatetruecolor($_width,$_height);



//輸出映像
header('Content-Type:image/png');
imagepng($_img);

輸出結果為
------解決方案--------------------


Notice: Undefined variable: _rnd_code in D:\AMP\web\ide_tmp.php on line 53



Warning: Division by zero in D:\AMP\web\ide_tmp.php on line 53



Notice: Undefined variable: _heght in D:\AMP\web\ide_tmp.php on line 53



Warning: mt_rand(): max(0) is smaller than min(1) in D:\AMP\web\ide_tmp.php on line 53



Notice: Undefined variable: _rnd_code in D:\AMP\web\ide_tmp.php on line 53



Warning: Division by zero in D:\AMP\web\ide_tmp.php on line 53



Notice: Undefined variable: _heght in D:\AMP\web\ide_tmp.php on line 53



Warning: mt_rand(): max(0) is smaller than min(1) in D:\AMP\web\ide_tmp.php on line 53



Notice: Undefined variable: _rnd_code in D:\AMP\web\ide_tmp.php on line 53



Warning: Division by zero in D:\AMP\web\ide_tmp.php on line 53



Notice: Undefined variable: _heght in D:\AMP\web\ide_tmp.php on line 53



Warning: mt_rand(): max(0) is smaller than min(1) in D:\AMP\web\ide_tmp.php on line 53



Notice: Undefined variable: _rnd_code in D:\AMP\web\ide_tmp.php on line 53



Warning: Division by zero in D:\AMP\web\ide_tmp.php on line 53



Notice: Undefined variable: _heght in D:\AMP\web\ide_tmp.php on line 53



Warning: mt_rand(): max(0) is smaller than min(1) in D:\AMP\web\ide_tmp.php on line 53



Notice: Undefined variable: _rnd_code in D:\AMP\web\ide_tmp.php on line 53



Warning: Division by zero in D:\AMP\web\ide_tmp.php on line 53



Notice: Undefined variable: _heght in D:\AMP\web\ide_tmp.php on line 53



Warning: mt_rand(): max(0) is smaller than min(1) in D:\AMP\web\ide_tmp.php on line 53

‰PNG
按錯誤資訊修改
然後得:
仍然是不友好的“驗證碼”圖片

------解決方案--------------------
將header注釋掉,開啟錯誤就可以看到錯誤。
  • 聯繫我們

    該頁面正文內容均來源於網絡整理,並不代表阿里雲官方的觀點,該頁面所提到的產品和服務也與阿里云無關,如果該頁面內容對您造成了困擾,歡迎寫郵件給我們,收到郵件我們將在5個工作日內處理。

    如果您發現本社區中有涉嫌抄襲的內容,歡迎發送郵件至: info-contact@alibabacloud.com 進行舉報並提供相關證據,工作人員會在 5 個工作天內聯絡您,一經查實,本站將立刻刪除涉嫌侵權內容。

    A Free Trial That Lets You Build Big!

    Start building with 50+ products and up to 12 months usage for Elastic Compute Service

    • Sales Support

      1 on 1 presale consultation

    • After-Sales Support

      24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.