The plugin generated xxx characters of unexpected output during activation

Question

I am creating WordPress plugin to display Total Twitter counter & Feed Subscriber. You can manage it via widget.

I am getting this error.

The plugin generated 123 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.

<?php
/*
 * Plugin Name: Twitter & RSS Stats
 * Version: 1.0
 * Plugin URI: http://sss.com/
 * Description: Facebook, Twitter & RSS Social Stats widget <a href="http://jessealtman.com/2009/06/08/tutorial-wordpress-28-widget-api/">tutorial</a>.
 * Author: Ajay Patel
 * Author URI: http://sss.com/
 */

addHeaderCode();
 function addHeaderCode() {

            echo '<link type="text/css" rel="stylesheet" href="' . get_bloginfo('wpurl') . '/wp-content/plugins/TRR_Stats/css/style.css" />' . "\n";    
            }


 /*******************************/
 /*     Create table            */
 /********************************/
function my_plugin_create_table()
{
        // do NOT forget this global
    global $wpdb;

    // this if statement makes sure that the table doe not exist already
    if($wpdb->get_var("show tables like TRR_Stats") != 'TRR_Stats') 
    {
        $sql = "CREATE TABLE TRR_Stats (
        id mediumint(9) NOT NULL,
        rss_email tinytext NOT NULL,
        twitter tinytext NOT NULL,
        rss tinytext NOT NULL,
        UNIQUE KEY id (id)
        );";
        require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
        dbDelta($sql);
    }
}
// this hook will cause our creation function to run when the plugin is activated
register_activation_hook( __FILE__, 'my_plugin_create_table' );


class FTRWidget extends WP_Widget
{
    /**
    * Declares the FTRWidget class.
    *
    */
    function FTRWidget(){
        $widget_ops = array('classname' => 'widget_hello_world', 'description' => __( "Example widget demoing WordPress 2.8 widget API") );
        $control_ops = array('width' => 300, 'height' => 300);
        $this->WP_Widget('helloworld', __('Twitter & RSS Social Stats'), $widget_ops, $control_ops);
    }

    /**
    * Displays the Widget
    *
    */
    function widget($args, $instance){
        extract($args);
        $rss_email = empty($instance['rss_email']) ? 'webdesignergeeks' : $instance['rss_email'];
        $twitter = empty($instance['twitter']) ? 'webdesignergeek' : $instance['twitter'];
        $rss = empty($instance['rss']) ? 'webdesignergeeks' : $instance['rss'];


        # Featch Data from table
        global $wpdb;
        $item_info = $wpdb->get_row("SELECT * FROM TRR_Stats WHERE id=1;");
        $rss_email_f = $item_info->rss_email;

        $url = file_get_contents('https://feedburner.google.com/api/awareness/1.0/GetFeedData?uri=24thfloor');
        preg_match( '/circulation="(\d+)"/', $url, $matches );
        if ( $matches[1] )
        $rss_f = $matches[1] . " Subscribers";
        else
        echo "0";

        $twit = file_get_contents('http://twitter.com/users/show/'.$twitter.'.xml');
        preg_match( '/\<followers_count\>(\d+)\<\/followers_count\>/', $twit, $matches );
        if ( $matches[1] )
        $twitter_f = $matches[1] . " Followers";
        else
        $twitter_f = "0";



        echo '
            <div class="sidebarContainer" id="sidebarSubscribe">

            <a target="_blank" href="http://twitter.com/'.$twitter.'" class="subscribeSidebarBox" id="followTwitter">
                <span class="icon"><img src="'.get_bloginfo('url').'/wp-content/plugins/TRR_Stats/img/twitter.png" alt="Twitter" /></span>
                <span class="title">Follow Us on Twitter</span>
                <span class="count">'.$twitter_f.'+</span>
            </a>

            <a target="_blank" href="http://feeds.feedburner.com/'.$rss.'" class="subscribeSidebarBox" id="subscribeRSS">
                <span class="icon"><img src="'.get_bloginfo('url').'/wp-content/plugins/TRR_Stats/img/rss_feed.png" alt="RSS"/></span>
                <span class="title">Subscribe to our RSS feed</span>
                <span class="count">'.$rss_f.'+</span>
            </a>

            <a target="_blank" href="http://feedburner.google.com/fb/a/mailverify?uri='.$rss_email_f.'" class="subscribeSidebarBox" id="subscribeEmail">
                <span class="icon"><img src="'.get_bloginfo('url').'/wp-content/plugins/TRR_Stats/img/rss_email.png" alt="rss_email" /></span>

                <span class="title">Subscribe for updates via</span>
                <span class="count">EMAIL</span>
            </a>
        </div>';

        # After the widget
        echo $after_widget;
    }


    /**
    * Saves the widgets settings.
    *
    */
    function update($new_instance, $old_instance){
        $instance = $old_instance;
        $instance['rss_email'] = strip_tags(stripslashes($new_instance['rss_email']));
        $instance['twitter'] = strip_tags(stripslashes($new_instance['twitter']));
        $instance['rss'] = strip_tags(stripslashes($new_instance['rss']));

        global $wpdb;
            //Insert First time
            $wpdb->insert( 'TRR_Stats', array(
            'id'    => 1,
            'rss_email' => $instance['rss_email'], 
            'twitter' => $instance['twitter'],
            'rss' => $instance['rss']
            ) 
        );

        //Rest Update Data
        global $wpdb;
            $wpdb->update( 'TRR_Stats', 
            array( 
                'rss_email' => $instance['rss_email'], 
                'twitter' => $instance['twitter'],
                'rss' => $instance['rss']
            ),
            array(
                'id' => 1
            )

        );

        return $instance;
    }

    /**
    * Creates the edit form for the widget.
    *
    */
    function form($instance){
        //Defaults
        $instance = wp_parse_args( (array) $instance, array('rss_email'=>'', 'twitter'=>'engiguide', 'rss'=>'www.rss_email.com/engiguide') );

        $rss_email = htmlspecialchars($instance['rss_email']);
        $twitter = htmlspecialchars($instance['twitter']);
        $rss = htmlspecialchars($instance['rss']);

        # Output the options

        # Twitter
        echo '<p style="text-align:right;"><label for="' . $this->get_field_name('twitter') . '">' . ('Twitter:') . ' <input style="width: 200px;" id="' . $this->get_field_id('twitter') . '" name="' . $this->get_field_name('twitter') . '" type="text" value="' . $twitter . '" /></label></p>';
        echo '<p style="padding-left: 110;">i.e: webdesignergeeks</p>';
        # Rss
        echo '<p style="text-align:right;"><label for="' . $this->get_field_name('rss') . '">' . __('Rss:') . ' <input style="width: 200px;" id="' . $this->get_field_id('rss') . '" name="' . $this->get_field_name('rss') . '" type="text" value="' . $rss . '" /></label></p>';
        echo '<p style="padding-left: 110;">i.e: webdesignergeeks</p>';
        # Rss Email
        echo '<p style="text-align:right;"><label for="' . $this->get_field_name('rss_email') . '">' . ('Rss Email:') . ' <input style="width: 200px;" id="' . $this->get_field_id('rss_email') . '" name="' . $this->get_field_name('rss_email') . '" type="text" value="' . $rss_email . '" /></label></p>';
        echo '<p style="padding-left: 110;">i.e: webdesignergeeks</p>';

    }

}// END class

    /**
    * 
    * Calls 'widgets_init' action after the Hello World widget has been registered.
    */
    function TTRInit() {
    register_widget('FTRWidget');
    }   
    add_action('widgets_init', 'TTRInit');
?>

finally i have launched this plugin link : http://wordpress.org/extend/plugins/twitter-rss-social-stats/ — Ajay Patel, Nov 08 '11 at 11:50
@ManikThakur this is not generally a good idea. It is advised that you resolve all errors and warnings before completing your plugin development. — Ehsan88, Oct 14 '18 at 09:48
Sometimes this happens because you have non-php code in your plugin file. In other words, you shouldn't `echo` anything directly and your `` end right at the end. My 2 character unexpected input was just because of a new line before ` — Ehsan88, Oct 14 '18 at 09:50

score 13 · Answer 1 · answered Apr 26 '13 at 11:33

13

I got extra "xxx" white spaces after the final php closing tag. Removed it and the warning is gone. Those white spaces were the "unexpected output".

answered Apr 26 '13 at 11:33

Binod Kalathil

1,939
1
30
43

This is the right answer in my case. Remover any spaces or lines after the closing php tag like this one `?>` from every PHP file you have in your plugin. – Atif Dec 05 '14 at 07:28
this answer works only, lol... – w411 3 May 18 '19 at 12:43
It's not working for me. – user9437856 Nov 20 '22 at 05:29
Did you check all the files of the plugin? – Binod Kalathil Nov 25 '22 at 09:40

score 8 · Accepted Answer · answered Oct 11 '11 at 13:02

8

Remove space from start of tags. remove addHeaderCode(); from top and add this code add_action('wp_head', 'addHeaderCode'); to your file after addHeaderCode() function. its definitely resolve your problem.

answered Oct 11 '11 at 13:02

Ram Ram

300
3
7

score 5 · Answer 3 · edited Oct 19 '13 at 10:30

5

it was a UTF8 related issue. I converted it with Notepad++ in UTF8 but I had to conert it in "UTF8 (without BOM)". Now I don't have any notice.

edited Oct 19 '13 at 10:30

kleopatra

51,061
28
99
211

answered Oct 19 '13 at 10:25

Umair Hamid

3,509
3
23
25

prakash · Answer 4 · 2012-01-18T07:42:07.133

2

You should try this:

remove white spaces
run function plugin_error()
in wp_config.php file set wp_DEBUG true , that will help you to see errors

This might help you.

edited Jan 18 '12 at 07:42

answered Jan 17 '12 at 11:15

prakash

99
1
7

I have downvoted your answer because of your reference to the plugin_error() function that is referenced nowhere. – Stephen Miller May 26 '21 at 14:45

score 1 · Answer 5 · answered Oct 11 '11 at 12:32

1

I don't think you should be sending any output in addHeaderCode(), this occurs far too early. See Actions Run During a Typical Request.

Instead, try hooking to wp_head to add your stylesheet, which should be triggered between <head>...</head>.

answered Oct 11 '11 at 12:32

agtb

477
4
15

i have solved it 70% the problem is speacing and comments make it buggy ,now i am syuck in to include css in this plugin – Ajay Patel Oct 11 '11 at 12:42
The problem is you're sending output to the browser before the rest of the page - add your stylesheet reference in the appropriate place with add_action('wp_head', 'addHeaderCode'); – agtb Oct 11 '11 at 12:50
fin thanks for css help now apptox all r solved man thanks a lot – Ajay Patel Oct 11 '11 at 12:57
No worries =) It's also worth bearing in mind that you can also accidentally send output before headers if you've got spaces or blank lines before – agtb Oct 11 '11 at 13:03

score 0 · Answer 6 · answered Jun 02 '13 at 08:46

0

You can remove update() function without this function it will work fine and will do same thing you are doing.

answered Jun 02 '13 at 08:46

Mandeep Gill

4,577
1
28
34

score 0 · Answer 7 · answered Nov 24 '15 at 09:45

0

I had the same issue with WooCommerce Smart Coupons plugin. I removed all extra new lines from plugin php files and saved them in "UTF8 (without BOM)" (as @Umaie Hamid mentioned). This fixed the issue.

answered Nov 24 '15 at 09:45

Vajira Lasantha

2,435
3
23
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score 0 · Answer 8 · answered Dec 08 '15 at 04:08

0

I've fixed this by removing the spaces in the code using the "edit plugin" in the WP admin. I think when WP save the changes it also does all the necessary settings like saving the file as UTF-8.

answered Dec 08 '15 at 04:08

Wreeecks

2,186
1
33
53

score 0 · Answer 9 · edited Oct 28 '12 at 03:29

0

Try wrapping the message with __() like __("Hello, world!") did the trick for me.

edited Oct 28 '12 at 03:29

Prasad Jadhav

5,090
16
62
80

answered Mar 20 '12 at 11:35

Rahul Gulati

1

The `__()` and `_e()` functions only deal with translation. – Ty Bailey Mar 29 '16 at 15:08

score -1 · Answer 10 · answered Feb 21 '14 at 18:05

-1

I Was getting same error just remove white spacing in your code.

answered Feb 21 '14 at 18:05

Aniket

1

The plugin generated xxx characters of unexpected output during activation

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