Title: Plugin causing PHP errors on is_feed() function
Last modified: August 22, 2016

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# Plugin causing PHP errors on is_feed() function

 *  [Tim Nicholson](https://wordpress.org/support/users/timnicholson/)
 * (@timnicholson)
 * [11 years, 5 months ago](https://wordpress.org/support/topic/plugin-causing-php-errors-on-is_feed-function/)
 * When I activate the plugin I get the following error. My test site has errors
   being displayed so I can catch things like this.
 * `Notice: is_feed was called incorrectly. Conditional query tags do not work before
   the query is run. Before then, they always return false. Please see Debugging
   in WordPress for more information. (This message was added in version 3.1.) in
   xtremelysocial.com/test/wp-includes/functions.php on line 3547`
 * This happens even when I turn OFF all options within the plugin. Meaning it happens
   even when no javascript, CSS, or HTML is being minified.
 * Since the error is happening within WordPress core itself, this is really hard
   to try to debug. I’m very proficient with PHP and WordPress (I have 4 themes 
   on WordPress.org), but I’d need to be pointed in the right direction from the
   standpoint of this particular plugin as I’m not familiar with it.
 * [https://wordpress.org/plugins/wp-minify-fix/](https://wordpress.org/plugins/wp-minify-fix/)

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Thread Starter [Tim Nicholson](https://wordpress.org/support/users/timnicholson/)
 * (@timnicholson)
 * [11 years, 5 months ago](https://wordpress.org/support/topic/plugin-causing-php-errors-on-is_feed-function/#post-5598930)
 * I see no way to fix this other than to modify the code. The offending call to
   is_feed() is done right when the plugin class is created. That’s why just activating
   the plugin creates the error. Obviously I can remove that check for is_feed().
   I’m sure that won’t negatively impact the plugin, but it will call the minification
   utility for each hit to the RSS feed.
 * There has to be a better way to filter on when the minification should occur,
   but I’ve not written plugins like this to have a good suggestion. Other than 
   the generic suggestion to go ahead and add the init and wp_footer actions, but
   then check for is_feed() in those functions and bail out. I’m not 100% sure is_feed()
   can be called in init, though, without literally testing it.
 *     ```
       function WPMinify() {
           // initialize common functions
           $this->c = new WPMinifyCommon($this);
   
           // load translation
           $this->c->load_text_domain();
   
           // register admin scripts
           add_action('admin_init', array($this->c, 'a_register_scripts'));
           add_action('admin_init', array($this->c, 'a_register_styles'));
   
           // check wp version
           add_action('admin_head', array($this->c, 'a_check_version'));
   
           // load admin menu
           add_action('admin_menu', array($this, 'a_menu'));
   
           // register ajax handler
           add_action('wp_ajax_wpm', array($this, 'a_ajax_handler'));
   
           // No need to minify admin stuff
           if (!is_admin() && !is_feed() && !defined('XMLRPC_REQUEST')) {
             // Don't minify if if user passes wp-minify-off=1 in GET parameter
             if (!(isset($_GET['wp-minify-off']) && $_GET['wp-minify-off'])) {
               add_action('init', array($this, 'pre_content'), 99999);
               add_action('wp_footer', array($this, 'post_content'), 99999);
             }
             // advertise hook
             add_action('wp_footer', array($this, 'advertise'));
           }
         }
       ```
   
 *  Thread Starter [Tim Nicholson](https://wordpress.org/support/users/timnicholson/)
 * (@timnicholson)
 * [11 years, 5 months ago](https://wordpress.org/support/topic/plugin-causing-php-errors-on-is_feed-function/#post-5598931)
 * Ok, that works perfectly. It would be great if you could update the plugin. Get
   rid of the call to is_feed() where it is. TRN are my initials, so this is how
   I “mod mark” adds and deletes
 *     ```
       // No need to minify admin stuff
           //TRN:DEL if (!is_admin() && !is_feed() && !defined('XMLRPC_REQUEST')) {
           if (!is_admin() && !defined('XMLRPC_REQUEST')) { //TRN:ADD
       ```
   
 * Then add the check in function pre_content() and post_content() like this:
 *     ```
       function pre_content() {
         	if ( is_feed() ) return; //TRN:ADD
           $wpm_options = get_option($this->name);
           if ($wpm_options['uri_exclude'] && count($wpm_options['uri_exclude'])) {
             foreach ($wpm_options['uri_exclude'] as $exclude_pat) {
               $exclude_pat = trim($exclude_pat);
               if (strlen($exclude_pat) > 0 && strpos($_SERVER['REQUEST_URI'], $exclude_pat) !== false) {
                 return;
               }
             }
           }
       ```
   
 *     ```
       function post_content() {
         	if ( is_feed() ) return; //TRN:ADD
           // sanity checking
           if ($this->buffer_started) {
             ob_end_flush();
           }
         }
       ```
   
 * I’m surprised this error doesn’t happen for everyone using the plugin. I guess
   maybe most people don’t have a test site or don’t have errors turned on.

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Plugin causing PHP errors on is_feed() function’ is closed to new replies.

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## Tags

 * [is_feed](https://wordpress.org/support/topic-tag/is_feed/)

 * 2 replies
 * 1 participant
 * Last reply from: [Tim Nicholson](https://wordpress.org/support/users/timnicholson/)
 * Last activity: [11 years, 5 months ago](https://wordpress.org/support/topic/plugin-causing-php-errors-on-is_feed-function/#post-5598931)
 * Status: not resolved