add_filter('the_content', 'myfunction') doesn't work when multi site.

[matsubobo]

I wrote simple plugin code to test the issue.

function myfunction($content) {
        $content = 'test'.$content;
        return $content;
}
add_filter('the_content', 'myfunction');

The code works single wordpress and main site when multi site setting. However, child-sites when multi site setting.

WP 3.0 and 3.1 have same issue.

[nacin]

The plugin needs to be network activated, otherwise it isn't included apart from the main site. Plugins are maintained on a per-site basis by default.

For additional help, please try the multisite support forums: ​http://wordpress.org/support/forum/multisite/.

[matsubobo]

I think I understood how plugin is activated on multi site.

I also tried following code to analyze the plugin is activated.

function myfunction($content) {
        print 'this block is passed.';
        $content = 'test'.$content;
        return $content;
}
add_filter('the_content', 'myfunction');

"'this block is passed." was displayed but "test" was not displayed on child-sites.
Both "this block is passed" and "test" where displayed on the main site.

[matsubobo]

test code

[nacin]

You're not activating the plugin on each of the child sites.

The plugin needs to be network activated, otherwise it isn't included apart from the main site. Plugins are maintained on a per-site basis by default.

For additional help, please try the multisite support forums: ​http://wordpress.org/support/forum/multisite/.

[matsubobo]

I found a solution.

Some other plugin removes my original filter so I set high priority.

add_filter('the_content', 'cyta_modify', -10000);

[jorbin]

This looks like it might be a duplicate of #15705