Drupal PHP执行两次

Question

After running a drush update on my drupal 7 site, the php code that I use to bring in user information for a form executes twice. This is a problem because I have created some functions in the php that get called so when it executes the PHP the second time it tries to re-declare the functions and I get errors like this:

PHP Fatal error:  Cannot redeclare fooBar() (previously declared in [path_to_drupal7]/modules/php/php.module(80) : eval()'d code:3) in [path_to_drupal7]/modules/php/php.module(80) : eval()'d code on line 4

It doesn't matter what the function is called or what it does. In this example case this is the code:

<?php
function fooBar() {
    print "foo bar";
}

fooBar();
?>

It also doesn't seem to matter what content type the page is (I my case I need it to bring user information into a form).

Why is Drupal executing the PHP twice? And more importantly, how can I keep it from doing so?

EDIT: Drupal seems to be executing the php once for the trimmed version and once for full version and once for the full version. This is what I expect when I preview the post. I don't really care about the preview version so I would be happy to get rid of it. Why is Drupal executing the code twice when I view the page? (why is it running it for the trimmed version when I'm actually viewing the page?)

Answer 1

Something must be re-including/requiring the file containing this function or you have this function within a loop. Find that, or, wrap it with function_exists .

<?php

if (!function_exists('fooBar')) {
    function fooBar() {
        print "foo bar";
    }
}

fooBar();

Answer 2

Like you said, the php you entered as input is being eval'd twice....once for the teaser, and once for the full body text.

Best practice : Don't define functions with eval. It can get messy fast.

Better practice : eval = evil. Don't use it.

In the time it takes to debug the problem, you could have written a very basic module that defines fooBar, then you can execute it from your PHP input field if you want.