if ( is_user_logged_in() ) { ... } causes php error in plugin, why, and what can I use?

I have a plugin that I only want logged in users to be able to use.

I opened the plugin's php file and surrounded the script with:

if ( is_user_logged_in() ) { /*script here*/  }

but that causes a php error and gives me a blank page.

I also tried:

get_currentuserinfo() ;

and then did an if based on $user_level >= 1  but that resulted in a blank page as well. In testing, I found that as soon as I put in the get_currentuserinfo() ;  I get the error.

I tested just a general if statement surrounding the script, ie:

$test = 'no';
if ($test == 'test') { /*script here*/ }

and that works, the page loads, the plugin isn't available.

Why would is_user_logged_in()  and  get_currentuserinfo()  cause errors?  And what alternatives are there for me?

Chris
St_Aug_Beach_BumAsked:
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Jason C. LevineNo oneCommented:
This isn't particularly easy to troubleshoot without the plugin code, but I'll give it a shot.

The reason I think your WordPress-based checks are failing are because they are simple inline checks.  But those functions are part of pluggable.php and that file loads after plugins load.  So essentially you are calling on non-defined functions and you're either generating an error that's suppressed (check your error logs) or you're creating a condition that can never evaluate to true.

The way to avoid this is to wrap your logic inside of a function and then hook that function on init so it fires after the plugin and pluggable are loaded. That should validate the user being logged in and process the rest of your code as intended:

add_action( 'init', 'some_function_that_needs_user_info' );
function some_function_that_needs_user_info() {
    global $current_user;
    get_currentuserinfo();

    // Now do stuff
}

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or something like that.
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St_Aug_Beach_BumAuthor Commented:
Ah - thank you very much - great explanation and plain-spoken just enough that I actually understand exactly what you are saying, while still leaving in all the details I need to know to do it myself :)

I can do this - thank again!

Chris
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St_Aug_Beach_BumAuthor Commented:
And in practice, works perfect!
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Jason C. LevineNo oneCommented:
Great, glad you got it working.
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