[wp-trac] [WordPress Trac] #11537: Warning: Cannot modify header information… in class-json.php

[WordPress Trac]

#11537: Warning: Cannot modify header information… in class-json.php
------------------------------+---------------------------------------------
 Reporter:  zigazou           |       Owner:  westi
     Type:  defect (bug)      |      Status:  new  
 Priority:  normal            |   Milestone:  2.9.1
Component:  Warnings/Notices  |     Version:  2.9  
 Severity:  normal            |    Keywords:       
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 I installed the Mappress plugin and Wordpress 2.9 started showing these
 messages :

 When displaying a page/article :
 Warning: Cannot modify header information - headers already sent by
 (output started at /home/expote/public_html/wp-
 content/themes/atahualpa/header.php:2) in /home/expote/public_html/wp-
 includes/class-json.php on line 238

 When editing a page/article :
 Warning: Cannot modify header information - headers already sent by
 (output started at /home/expote/public_html/wp-admin/admin-header.php:18)
 in /home/expote/public_html/wp-includes/class-json.php on line 238

 This bug occurs when :

 - the PHP version does not have the json_encode function (I've got a PHP
 4.4.9 version)

 - a plugin tries to use the json_encode function

 After looking at class-json.php, it seems odd to me that the encode method
 of the Services_JSON class outputs HTTP headers since it is used to
 emulate the json_encode of PHP 5 which does not send headers.

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Ticket URL: <http://core.trac.wordpress.org/ticket/11537>
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