Support » Plugin: EWWW Image Optimizer » Problem with exec() error

  • Resolved DolphinGuy


    Thanks for the great plugin, if I can get it installed. -:)

    I am running CentOS and have read everything on the internet possible about activating exec(). I have root admin to my server so, there’s no problem enabling or disabling commands. I am also not running in safe mode.

    Can you please give me a couple step-by-step tips how to get exec() going so that I can get on with installing your wonderful plugin.

    Thanks much.

Viewing 15 replies - 1 through 15 (of 19 total)
  • Plugin Author nosilver4u


    Just to make sure we’re actually on the right track here, does the plugin actually give a warning about exec()?

    Immediately after activating the plugin the error message, “EWWW Image Optimizer requires exec(). Your system administrator has disabled this function.” comes across the top of the Admin page. If I deactivate the plugin, the message will go away. I’ve installed the plugin on two domains, both on the same server, with the same resulting error.

    I am the system admin, with root access, and exed() is not disabled, nor am I running in safe mode as many web help articles indicate might be the problem.

    Plugin Author nosilver4u


    Create a file called info.php with these contents on your server:

    <?php phpinfo(); ?>

    Then post the url to that file here.

    Thanks for getting back so quickly, Sorry took so long. Installed the file as you requested and here is the URL:

    Plugin Author nosilver4u


    Ok, go ahead and delete the info.php file (don’t want to leave it available for hackers to scavenge for info on your server setup).

    Anyway, exec() is disabled by suhosin, probably in this file: /etc/php.d/suhosin.ini

    Nothing in that file about safe mode or exec(). I have searched the entire file, including all other file in the same folder, and found nothing concerning safe mode on or off, or anything about exec()disabled.

    Plugin Author nosilver4u


    The setting you are looking for is this one:


    The exec function is at the very end of that list. I had assumed it would be in the suhosin config file, but it may be somewhere else, or perhaps that is just a default that needs an override to keep it from blocking exec.

    Great and thanks for the super excellent support on your plugin. I found it.

    Here is what the section says:

    ; Comma separated blacklist of functions that are not allowed to be called. If
    ; no whitelist is given, calling a function within the blacklist will terminate
    ; the script and get logged.
    ;suhosin.executor.func.blacklist =

    So, what do I put at the end of it? What am I to do with it now?

    Should I place somethingon the whitelist?

    ; Comma separated whitelist of functions that are allowed to be called from
    ; within eval(). If the whitelist is empty the blacklist is evaluated,
    ; otherwise calling a function not in the whitelist will terminate the script
    ; and get logged.
    ;suhosin.executor.eval.whitelist =

    Plugin Author nosilver4u


    If you remove the semi-colon (;) from the beginning of the line, it will tell it not to blacklist any functions (probably have to restart your webserver afterwards).

    Hum… Getting a little discouraged. I removed the semi-colon as indicated and still same exact error appearing.

    I removed the semi-colon and restarted http..

    suhosin.executor.eval.whitelist =

    I am installing on another server complete now to see if I get the same error. It is a beta server, I can give you root access if you’d like to figure it out. Thanks, Loui

    Plugin Author nosilver4u


    Sorry, wrong setting. You should remove the semi-colon for suhosin.executor.func.blacklist, definitely not the whitelist.


    Thanks for the great support. Prompt and fast. Got it working!

    Stay in touch.

Viewing 15 replies - 1 through 15 (of 19 total)
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