Support » Plugin: WordPress Advanced Hook Sniffer » PHP Error on activation

  • Resolved NateWr


    When I try to activate this plugin, it makes a require_once() call to load wp-hook-sniff-core.php. This fails because the plugin’s folder name is (mis)defined.

    The error occurs on line 71 of wp-hook-sniffer.php. Here’s the relevant code:

    /* Define the component's parent folder name */
    	define( 'WP_HOOK_PLUGIN_NAME', 'wordpress-hook-sniffer' );
    	/* Define the component's loader file -- this file */
    	define( 'WP_HOOK_PLUGIN_LOADER', 'wp-hook-sniffer.php' );
    	/* Define component's directory and URL Paths */
    	/* WordPress is installed and activated, finish initialization and go! */
    	require_once( WP_HOOK_PLUGIN_DIR . '/wp-hook-sniff-core.php' );

    Notice that the WP_HOOK_PLUGIN_NAME is ‘wordpress-hook-sniffer’ but the plugin installs to ‘hook-sniffer’ when installed through the WP admin dashboard. Since people can rename the plugin directory, I find the following a more reliable way to define the plugin path info:

    define( 'PLUGIN_DIR', untrailingslashit( plugin_dir_path( __FILE__ ) ) );
    define( 'PLUGIN_URL', untrailingslashit( plugins_url( basename( plugin_dir_path( __FILE__ ) ), basename( __FILE__ ) ) ) );
    define( 'PLUGIN_FNAME', plugin_basename( __FILE__ ) );

Viewing 10 replies - 1 through 10 (of 10 total)
  • FYI, in case anyone else runs into the same issue. This also means that I can’t deactivate the plugin through the interface, so it has not restored the default /wp-includes/plugin.php file. I needed to manually restore this file to prevent a PHP notice from displaying on the permalinks page.

    Plugin Author Mirco Babini


    Thank you so much for your feedback.

    I’ll fix that asap today.

    Thanks again.


    Please check the plugin on wp3.9 it is throwing error on activation.

    Plugin Author Mirco Babini


    Check the latest 0.17 release.

    @natewr thank you so much for your feedback.
    @matifibrahim hope it works for you now.

    If you find the plugin useful, feel free to review it with some stars 🙂

    Thanks again,


    Throwing fatal error when go to Settings->WP Hook Sniffer

    Fatal error: Call to undefined function wp_register_plugin_realpath() in C:\wamp\www\wp3.9\wp-settings.php on line 213

    same error when you try to deactivate the plugin. A through testing is needed on wp3.9 if you want to resurrect this plugin. Thanks for your efforts.

    Plugin Author Mirco Babini


    It’s coz your WordPress is corrupted.
    As @natewr said you must replace the /wp-includes/plugin.php file.

    I’m sorry, it’s here.


    Hey Mirco, I have a modified plugin.php file that has the missing functions restored. I can provide by email, please contact me by replying to the [accidentally sent prematurely] email to you via contact form on your site.

    I put my new file in place of your ‘modified’ version, and I was able to activate the plugin on 3.9.1 without getting a fatal error. Unfortunately I didn’t get any output either, even after checking all possible types of output in the settings page. So there’s something else wrong but at least this avoids manual replacement of plugin.php to restore normal site operation.

    Thanks for your work on this. I hope you will contact me for the file, and that it will help. There are two sections where functions had to be added, and I commented the beginning and end of each section with my initials so you can easily zero in on the changes.

    Plugin Author Mirco Babini


    Latest 0.18 version fixes the issue, accordingly to this closed issue.

    Cheers (please leave a review),

    I downloaded this today and it corrupted my plugins file so I reverted back to the old one. Not sure if it’s the same issue as above or a new one with the latest version.

    Using 3.9.2

    Plugin Author Mirco Babini


    Really sorry but I can’t reproduce the issue.

    I just installed a fresh latest version of WordPress (3.9.2), installed the plugin from the store, activated it, used it, deactivated it and that’s it. It works good.

    Can you try to provide more info?

Viewing 10 replies - 1 through 10 (of 10 total)
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