打開phpmyadmin首頁，一片空白，什麼提示報錯也沒有，折騰到深夜3點，無果。第二天早上又繼續換了好幾個關鍵詞搜索，才找到和我情況匹配的答案，原來是我禁用了ini_set函數。
由於phpmyadmin3.3.7版本的已知漏洞，存在安全性問題，所以打算升級phpmyadmin，從官方下載後，放到服務器，運行不正常，訪問phpMyAdmin 3.4.7中任何php程序都顯示空白頁。
首先根據pma的手冊：（內容如下www.it165.net）
Requirements
PHP
You need PHP 5.2.0 or newer, with session support (see FAQ 1.31) , the Standard PHP Library (SPL) extension and JSON support.
To support uploading of ZIP files, you need the PHP zip extension.
For proper support of multibyte strings (eg. UTF-8, which is currently the default), you should install the mbstring and ctype extensions.
You need GD2 support in PHP to display inline thumbnails of JPEGs (“p_w_picpath/jpeg: inline”) with their original aspect ratio
When using the “cookie” authentication method, the mcrypt extension is strongly suggested for most users and is required for 64–bit machines. Not using mcrypt will cause phpMyAdmin to load pages significantly slower.
To support upload progress bars, see FAQ 2.9.
To support BLOB streaming, see PHP and MySQL requirements in FAQ 6.25.
MySQL 5.0 or newer (details);
Web browser with cookies enabled.
分別檢測是那一塊出了問題。
放一個
<php
phpinfo();
?>
看了下，符合要求，鬱悶了！