I am writing a plugin for WordPress. My goal is make it work for everyone. Some pages use ajax responses. Some users have activated the WP_DEBUG constant that shows errors and warnings from themes and other plugins.
This breaks my Ajax PHPs because I include the Wordpress Core, and then WP can show warnings in some blogs!
The old way I solved this, is:
<?php
ob_start();
//The wordpress core require
ob_end_clean();
//Now the ajax response:
echo '0';
?>
However, one user reported a very strange bug: the ajax page never response, only works in Opera, and Google Chrome says: Error 330 (net::ERR_CONTENT_DECODING_FAILED):
Digging in the user web-server, I found that WP configuration, or a plugin or elsewere uses the ob_start("ob gzhandler").
The ob_get_status(true) shows in my working webserver:
Array
(
[0] => Array
(
[chunk_size] => 4096
[type] => 1
[status] => 0
[name] => default output handler
[del] => 1
)
[1] => Array
(
[chunk_size] => 0
[size] => 40960
[block_size] => 10240
[type] => 1
[status] => 0
[name] => default output handler
[del] => 1
)
)
And in the buggy web-server:
Array
(
[0] => Array
(
[chunk_size] => 4096
[type] => 1
[status] => 0
[name] => default output handler
[del] => 1
)
[1] => Array
(
[chunk_size] => 0
[size] => 40960
[block_size] => 10240
[type] => 1
[status] => 0
[name] => default output handler
[del] => 1
)
[2] => Array
(
[chunk_size] => 0
[size] => 40960
[block_size] => 10240
[type] => 1
[status] => 0
[name] => ob_gzhandler
[del] => 1
)
)
The sequence in my user web-server is:
- My code calls ob_start()
- Include WP core, WP initializes all and call ob_start("ob gzhandler")
- When my code call ob_end_clean() it fails.
I need a safe way to hide the WP warnings, but I can't break GZIP enabled configurations ( some plugin I suspect). If is not possible I prefer leave breaking ajax in warning systems and forget the buffer method.
I think a clean way may be:
$buffers = count(ob_get_status(true));
ob_start();
//The wordpress core require
if (count(ob_get_status(true)) == $buffers + 1) {
ob_end_clean();
} else {
ob_flush();
}
//Now the ajax response:
echo '0';
But I'm afraid some of the infinite combinations through PHP versions and configs, WP versions, plugins and configurations breaks somebody. What do you think is a good way to solve this problem?
