Recupero delle intestazioni già inviato errore dal plugin

Question

Recupero delle intestazioni già inviato errore dal plugin

0

11936 2013-07-05

Ho qualcheproblema con unerrore "intestazionigiàinviate" da unpluginper Wordpress che avevo creatoperme e orami sto adattando. Questo è l'errore:

Avviso: session_start () [function.session-start]: Impossibileinviare la sessione limitatore della cache -intestazionigiàinviate (l'output èiniziato da /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 sulla linea 225

Hoguardato la riga 2 di header.phpe questo è quello che c'è senza spazibianchiextrané caratteri divertentiecc:

 <!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; - '; }

Hoesaminato la riga 225in osu-rfm.phpe questo è ciò chefaparte di quelfile (questo èilpluginbtw):

 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();
    }
}

E ora sono completamentebloccatoperchénon so cosaprovare dopo ... qualcunopuò dare qualche suggerimento? Ho rimossotutto lo spaziobianco allafine e all'inizio dituttii mieifile deltema come suggerito qui ,manon sembrafare la differenza. Ho ancheprovato a rimuovereiltag di chiusura ?> allafine delfile delmioplug-in,manada.

Aproposito,questo accade solo sulmio server live,non sullamia configurazione locale,quindi ho la sensazione chepotrebbeessere unproblema del server.

Grazie

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

fonte
Osu

- Pubblica leprime 10 ogiù di lì righe di `header.php`
  
  Post the first 10 or so lines of `header.php`
  - 0
  - 2013-07-05
  - s_ha_dum
- Ciao @s_ha_dum,grazieper aver risposto - domanda originale aggiornata come richiesto
  
  Hi @s_ha_dum thanks for responding - original question updated as requested
  - 0
  - 2013-07-05
  - Osu
- Quelfile _dovrebbe_inviare l'output.Non è questoilproblema.Disattivail debug ___off___.Hai ancorailproblema?
  
  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
- Questo èilmodoin cuiilmio debugging èimpostatoin `wp-config.php`:` define ('WP_DEBUG',false); `- Presumo chetuintendessi quelloinvece diphp.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
- Qual è l'URL del sito live?
  
  What is the URL to the live site?
  - 0
  - 2013-07-05
  - s_ha_dum
- http://www.instrumentalbackgroundmusic.come questo è unesempio di unapagina chemostra l'errore: 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
- lasciaci [continuare questa discussionein chat] (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 risposta

voti

s_ha_dum · Accepted Answer · 2013-07-05

2

2013-07-05

Seguardiil sorgente dellapagina,vedrai questointorno alla riga 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>

Qualcosa sta cercando di avviare una sessionebene nel corpo dellapagina. Nonpuoifarlo. Le sessioni devonoessere avviateprima che qualsiasi contenuto vengainviato albrowser.

La soluzione a questoproblema è concettualmente semplice: aggancia lafunzione session_start a qualche hook che vieneeseguitoprima cheil contenuto venga stampato. Qualcosa di simile:

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

Non soesattamente cosa stia chiamando session_start operché,quindi la correzionepraticapotrebbeesserepiù complicatama questa è la correzione dibase.

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.