Beim Abrufen von Headern wurde bereits ein Fehler vom Plugin

Question

Beim Abrufen von Headern wurde bereits ein Fehler vom Plugin

0

11936 2013-07-05

gesendet

Ich habeein Problemmit einem Fehler "Headerbereitsgesendet" voneinem Wordpress-Plugin,dasichfürmicherstellt habe,undjetztpasseichmich an. Diesist der Fehler:

Warnung: session_start () [function.session-start]: Sitzung kannnichtgesendet werden Cache Limiter - Header wurdenbereitsgesendet (Ausgabegestartet um /home1/uname/directory/domain.com/wp-content/themes/ibm/header.php:2) im /home1/uname/directory/domain.com/wp-content/plugins/osu-rfm/osu-rfm.php in Zeile 225

Ich habemir header.php Zeile 2 angesehen und diesist das,wases ohne zusätzliche Leerzeichen oder lustige Zeichen usw.gibt:

 <!DOCTYPE html>
<!--[if lt IE 7 ]> <html class="ie ie6 no-js" <?php language_attributes(); ?>> <![endif]-->
<!--[if IE 7 ]>    <html class="ie ie7 no-js" <?php language_attributes(); ?>> <![endif]-->
<!--[if IE 8 ]>    <html class="ie ie8 no-js" <?php language_attributes(); ?>> <![endif]-->
<!--[if IE 9 ]>    <html class="ie ie9 no-js" <?php language_attributes(); ?>> <![endif]-->
<!--[if gt IE 9]><!--><html class="no-js" <?php language_attributes(); ?>><!--<![endif]-->
<!-- the "no-js" class is for Modernizr. -->

<head id="osu-rfm" data-template-set="html5-reset-wordpress-theme" profile="http://gmpg.org/xfn/11">

    <title>
           <?php
              if (function_exists('is_tag') && is_tag()) {
                 single_tag_title("Tag Archive for &quot;"); echo '&quot; - '; }

Ich habemir Zeile 225in osu-rfm.php angesehen und diesist Teil dieser Datei (diesist übrigens das Plugin):

 public static function enable_sessions()
{
    if( is_post_type_archive( "ibmdirectory" ) || "ibmdirectory" == get_post_type() )
    {
        if( ! isset( $_SESSION ) )
    /*
    if(headers_sent($filename, $linenum)) {
        //if headers already sent out print some message.
        echo "Headers already sent in $filename on line $linenum\n";
    } else {
        //if headers not already sent
        echo "New headers";
    }
    */
        session_start();
    }
}

Undjetzt steckeich völligfest,daichnicht weiß,wasich alsnächstes versuchen soll ... kannjemandeinige Vorschlägemachen? Ich habe alle Leerzeichen am Ende und am Anfang allermeiner Themendateienentfernt. aberes scheint keinen Unterschied zumachen. Ich habe auch versucht,das schließende ?> -Tag am Endemeiner Plugin-Datei zuentfernen,abernada.

Diesgeschieht übrigensnur aufmeinem Live-Server,nicht aufmeinem lokalen Setup. Ich habe also das Gefühl,dasses sich umein Serverproblem handeln könnte.

Danke

Osu

I'm having a bit of trouble with a 'headers already sent' error from a Wordpress plugin I had built for me and now I'm adapting. This is the error:

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home1/uname/directory/domain.com/wp-content/themes/ibm/header.php:2) in /home1/uname/directory/domain.com/wp-content/plugins/osu-rfm/osu-rfm.php on line 225

I've looked at header.php line 2 and this is what is there with no extra white spaces nor funny characters etc:

<!DOCTYPE html>
<!--[if lt IE 7 ]> <html class="ie ie6 no-js" <?php language_attributes(); ?>> <![endif]-->
<!--[if IE 7 ]>    <html class="ie ie7 no-js" <?php language_attributes(); ?>> <![endif]-->
<!--[if IE 8 ]>    <html class="ie ie8 no-js" <?php language_attributes(); ?>> <![endif]-->
<!--[if IE 9 ]>    <html class="ie ie9 no-js" <?php language_attributes(); ?>> <![endif]-->
<!--[if gt IE 9]><!--><html class="no-js" <?php language_attributes(); ?>><!--<![endif]-->
<!-- the "no-js" class is for Modernizr. -->

<head id="osu-rfm" data-template-set="html5-reset-wordpress-theme" profile="http://gmpg.org/xfn/11">

    <title>
           <?php
              if (function_exists('is_tag') && is_tag()) {
                 single_tag_title("Tag Archive for &quot;"); echo '&quot; - '; }

I've looked at line 225 in osu-rfm.php and this is what is part of that file (this is the plugin btw):

public static function enable_sessions()
{
    if( is_post_type_archive( "ibmdirectory" ) || "ibmdirectory" == get_post_type() )
    {
        if( ! isset( $_SESSION ) )
    /*
    if(headers_sent($filename, $linenum)) {
        //if headers already sent out print some message.
        echo "Headers already sent in $filename on line $linenum\n";
    } else {
        //if headers not already sent
        echo "New headers";
    }
    */
        session_start();
    }
}

And now I'm completely stuck as I don't know what to try next...can anyone make some suggestions? I removed all white space at the end and beginning in all my theme files as suggested here, but it doesn't seem to make a difference. I've also tried removing the closing ?> tag at the end of my plugin file, but nada.

By the way, this only happens on my live server, not my local set up, so I have the feeling it could be a server issue.

Thanks

Osu

Quelle
Osu

- Veröffentlichen Sie dieersten 10 Zeilen von `header.php`
  
  Post the first 10 or so lines of `header.php`
  - 0
  - 2013-07-05
  - s_ha_dum
- Hallo @s_ha_dum,dankefür die Antwort - die ursprüngliche Frage wurde wiegewünscht aktualisiert
  
  Hi @s_ha_dum thanks for responding - original question updated as requested
  - 0
  - 2013-07-05
  - Osu
- Diese Datei sollteeine Ausgabe senden.Dasistnicht das Problem.Schalten Sie das Debuggen ___off___ein.Hast dunoch dasproblem
  
  That file _should_ be sending output. That is not the problem. Turn debugging ___off___. Do you still have the problem?
  - 0
  - 2013-07-05
  - s_ha_dum
- So wirdmein Debuggingin `wp-config.php`eingerichtet:` define ('WP_DEBUG',false); `- Ichnehme an,Sie haben dasehergemeint alsphp.ini?
  
  This is how my debugging is set up in `wp-config.php` : `define('WP_DEBUG', false);` - I assume you meant that rather than php.ini?
  - 0
  - 2013-07-05
  - Osu
- Wie lautet die URL zur Live-Site?
  
  What is the URL to the live site?
  - 0
  - 2013-07-05
  - s_ha_dum
- http://www.instrumentalbackgroundmusic.com und diesistein Beispielfüreine Seite,auf der der Fehler angezeigt wird: http://www.instrumentalbackgroundmusic.com/royalty-free-music/test-track-jazz-indie/
  
  http://www.instrumentalbackgroundmusic.com and this is an example of a page that shows the error: http://www.instrumentalbackgroundmusic.com/royalty-free-music/test-track-jazz-indie/
  - 0
  - 2013-07-05
  - Osu
- Lassen Sie uns [diese Diskussionim Chatfortsetzen] (http://chat.stackexchange.com/rooms/9531/discussion-between-s-ha-dum-and-osu)
  
  let us [continue this discussion in chat](http://chat.stackexchange.com/rooms/9531/discussion-between-s-ha-dum-and-osu)
  - 0
  - 2013-07-05
  - s_ha_dum

1 Antworten

Stimmen

s_ha_dum · Accepted Answer · 2013-07-05

2

2013-07-05

Wenn Sie sich die Quelle der Seite ansehen,sehen Sie diesin Zeile 122:

 <div class="nav-collapse collapse">
                    <br />
<b>Warning</b>:  session_start() [<a href='function.session-start'>function.session-start</a>]: Cannot send session cookie - headers already sent by (output started at /home1/onesizeu/clients/instrumentalbackgroundmusic.com/wp-includes/functions.php:2841) in <b>/home1/onesizeu/clients/instrumentalbackgroundmusic.com/wp-content/plugins/osu-royaltfreemusic/osu-royaltyfreemusic.php</b> on line <b>225</b><br />
<br />
<b>Warning</b>:  session_start() [<a href='function.session-start'>function.session-start</a>]: Cannot send session cache limiter - headers already sent (output started at /home1/onesizeu/clients/instrumentalbackgroundmusic.com/wp-includes/functions.php:2841) in <b>/home1/onesizeu/clients/instrumentalbackgroundmusic.com/wp-content/plugins/osu-royaltfreemusic/osu-royaltyfreemusic.php</b> on line <b>225</b><br />
<ul id="menu-primary" class="nav"><li id="menu-item-9" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-9"><a href="http://www.instrumentalbackgroundmusic.com/">Home</a></li>

Es wird versucht,eine Sitzungbis weitin den Seitenkörper hinein zu starten. Das kannst dunichtmachen. Sitzungenmüssengestartet werden,bevor Inhalte an den Browsergesendet werden.

Die Lösung hierfürist konzeptionelleinfach: Verknüpfen Sie die Funktion session_startmit einem Hook,der ausgeführt wird,bevor der Inhaltgedruckt wird. Soetwas wie das:

 function boot_session() {
  session_start();
}
add_action('wp_loaded','boot_session');

Ich weißnichtgenau,was session_start aufruft oder warum,daherist diepraktische Lösungmöglicherweise komplizierter,aber dasist diegrundlegende Lösung.

If you look at the source of the page you will see this around line 122:

<div class="nav-collapse collapse">
                    <br />
<b>Warning</b>:  session_start() [<a href='function.session-start'>function.session-start</a>]: Cannot send session cookie - headers already sent by (output started at /home1/onesizeu/clients/instrumentalbackgroundmusic.com/wp-includes/functions.php:2841) in <b>/home1/onesizeu/clients/instrumentalbackgroundmusic.com/wp-content/plugins/osu-royaltfreemusic/osu-royaltyfreemusic.php</b> on line <b>225</b><br />
<br />
<b>Warning</b>:  session_start() [<a href='function.session-start'>function.session-start</a>]: Cannot send session cache limiter - headers already sent (output started at /home1/onesizeu/clients/instrumentalbackgroundmusic.com/wp-includes/functions.php:2841) in <b>/home1/onesizeu/clients/instrumentalbackgroundmusic.com/wp-content/plugins/osu-royaltfreemusic/osu-royaltyfreemusic.php</b> on line <b>225</b><br />
<ul id="menu-primary" class="nav"><li id="menu-item-9" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-9"><a href="http://www.instrumentalbackgroundmusic.com/">Home</a></li>

Something is trying to start a session well into the body of the page. You can't do that. Sessions need to be started before any content is sent to the browser.

The fix for this is conceptually simple-- hook the session_start function to some hook that runs before content is printed. Something like this:

function boot_session() {
  session_start();
}
add_action('wp_loaded','boot_session');

I don't know what, exactly, is calling session_start or why, so the practical fix may be more complicated but that is the basic fix.