PHP核心警告Web的基本安装的Yii 2框架

Question

我安装Yii框架后，当我访问后localhost/html/basic/web/顶页说Congratulations. You have successfully created your Yii-powered application.

的问题是底部的页面显示，看起来像这样

PHP Core Warning – yii\base\ErrorException 

Module 'mysql' already loaded 
2. yii\base\ErrorHandler::handleFatalError() 
$_SERVER = [ 
    'HTTP_HOST' => 'localhost', 
    'HTTP_CONNECTION' => 'keep-alive', 
    'HTTP_ACCEPT' => 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8', 
    'HTTP_UPGRADE_INSECURE_REQUESTS' => '1', 
    'HTTP_USER_AGENT' => 'Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36', 
    'HTTP_ACCEPT_ENCODING' => 'gzip, deflate, sdch', 
    'HTTP_ACCEPT_LANGUAGE' => 'en-US,en;q=0.8', 
    'HTTP_COOKIE' => '_csrf=f85409642b77bad50690d972a497f64ff6904dfe5503dff60053c82b25b1ae9da%3A2%3A%7Bi%3A0%3Bs%3A5%3A%22_csrf%22%3Bi%3A1%3Bs%3A32%3A%22ixW-YN54kOWQFRW4yXmZSXgGDOQ4eLjL%22%3B%7D; PHPSESSID=airgk9lps3lsg261pps59bos40', 
    'PATH' => '/usr/local/bin:/usr/bin:/bin', 
    'SERVER_SIGNATURE' => ' 
Apache/2.4.6 (Ubuntu) Server at localhost Port 80 

', 
    'SERVER_SOFTWARE' => 'Apache/2.4.6 (Ubuntu)', 
    'SERVER_NAME' => 'localhost', 
    'SERVER_ADDR' => '127.0.0.1', 
    'SERVER_PORT' => '80', 
    'REMOTE_ADDR' => '127.0.0.1', 
    'DOCUMENT_ROOT' => '/var/www', 
    'REQUEST_SCHEME' => 'http', 
    'CONTEXT_PREFIX' => '', 
    'CONTEXT_DOCUMENT_ROOT' => '/var/www', 
    'SERVER_ADMIN' => 'webmaster@localhost', 
    'SCRIPT_FILENAME' => '/var/www/html/basic/web/index.php', 
    'REMOTE_PORT' => '57773', 
    'GATEWAY_INTERFACE' => 'CGI/1.1', 
    'SERVER_PROTOCOL' => 'HTTP/1.1', 
    'REQUEST_METHOD' => 'GET', 
    'QUERY_STRING' => '', 
    'REQUEST_URI' => '/html/basic/web/', 
    'SCRIPT_NAME' => '/html/basic/web/index.php', 
    'PHP_SELF' => '/html/basic/web/index.php', 
    'REQUEST_TIME_FLOAT' => 1449020549.364, 
    'REQUEST_TIME' => 1449020549, 
]; 

$_COOKIE = [ 
    '_csrf' => 'f85409642b77bad50690d972a497f64ff6904dfe5503dff60053c82b25b1ae9da:2:{i:0;s:5:"_csrf";i:1;s:32:"ixW-YN54kOWQFRW4yXmZSXgGDOQ4eLjL";}', 
    'PHPSESSID' => 'airgk9lps3lsg261pps59bos40', 
]; 

$_SESSION = [ 
    '__flash' => [], 
]; 

错误

我该如何解决这个问题？对不起，我只是Yii 2的新手。

Answer 1

看起来像你的php配置问题，而不是yii。

try this steps it may help you , i search and found these solutions:<br> 
1. may be problem in the cached version of the request data. You could try clearing the folder under @runtime/debug. 
2. Use PHP 5.5 for developing the website.<br> 
3. Disable the "varnish cache" by adding this line of code to your .htaccess 
Header add "disablevcache" "true".