Hello,
I have a web application which is developed in cakePHP, but from last few week, a virus is affected to the site and its not showing any pages. even if we go to the source code, nothing is there to display.
I have checked the index.php, there is no extra entry. Can some help me to find out the solution. and, how can i prevent these virus attacks?
Thanks in advance
Check both the server's error logs and the PHP error log. No output in the browser generally indicates there's a problem with the script and "display_errors" is off, so you get nothing sent.
If you know for sure that you have a virus, then I cannot help you.
If there is a chance that its not a virus...
If you are running PHP, a 'white blank page' can be a symptom of a syntax error.
Somewhere in your code there may be a typo.
Ensure you can spot errors
Try:
turning on 'display errors'
setting 'error reporting' to display all type of errors
Temporally add this to the top of your script
<?php
//ensure errors are displayed
ini_set('display_errors', 1);
//show all type of errors apart from Notices
error_reporting(E_ALL ^E_NOTICE);
Also try removing the closing php tags from the bottom of pure-php scripts:
i.e change:
<?php
//i am 100% php
?>
to
<?php
//i am 100% php
Obviously, keep a closing php tag if it separates php from html.
This is a common coding-practice.
See, for example: - http://framework.zend.com/manual/en/coding-standard.php-file-formatting.html#coding-standard.php-file-formatting.general
Start debugging
A bit of brute force might help. Start at the top of the script and add something like:
<?php
//ensure errors are displayed
ini_set('display_errors', 1);
//show all type of errors apart from Notices
error_reporting(E_ALL ^E_NOTICE);
echo('hello - i got this far');
exit;
//...other code
Refresh the page. If you can see
hello - i got this far
Then you know that it is a problem that you can solve.
Tidy-up / comment-out those lines of code, mentioned above.
Then look into:
Debugging And The Scientific Method