PHP warning when shortcode function does not exist

[olivier.pons]

The problem is on wp-includes/shortcodes.php line 280: it may sometimes generates warnings because $m[5] is set but $shortcode_tags[$tag] is not set.

Just add those three lines after line 278:

279     if (!isset($shortcode_tags[$tag])) {
280         return false;
281     }

So no warning is raised. Here's a sample of the warning raised - just in case:

PHP Warning:  call_user_func() expects parameter 1 to be a valid callback, no array or string given in /mywebpath/wp-includes/shortcodes.php on line 286, referer: http://mywebsite/wp-admin/post.php?post=ccc&action=edit
PHP Stack trace:, referer: http://mywebsite/wp-admin/post.php?post=ccc&action=edit
PHP   1. {main}() /mywebpath/index.php:0, referer: http://mywebsite/wp-admin/post.php?post=ccc&action=edit
PHP   2. require() /mywebpath/index.php:17, referer: http://mywebsite/wp-admin/post.php?post=ccc&action=edit
PHP   3. require_once() /mywebpath/wp-blog-header.php:16, referer: http://mywebsite/wp-admin/post.php?post=ccc&action=edit
PHP   4. include() /mywebpath/wp-includes/template-loader.php:74, referer: http://mywebsite/wp-admin/post.php?post=ccc&action=edit
PHP   5. the_content() /mywebpath/wp-content/themes/krystallopolis/index.php:115, referer: http://mywebsite/wp-admin/post.php?post=ccc&action=edit
PHP   6. apply_filters() /mywebpath/wp-includes/post-template.php:221, referer: http://mywebsite/wp-admin/post.php?post=ccc&action=edit
PHP   7. call_user_func_array:{/mywebpath/wp-includes/plugin.php:213}() /mywebpath/wp-includes/plugin.php:213, referer: http://mywebsite/wp-admin/post.php?post=ccc&action=edit
PHP   8. do_shortcode() /mywebpath/wp-includes/plugin.php:213, referer: http://mywebsite/wp-admin/post.php?post=ccc&action=edit
PHP   9. preg_replace_callback() /mywebpath/wp-includes/shortcodes.php:197, referer: http://mywebsite/wp-admin/post.php?post=ccc&action=edit
PHP  10. do_shortcode_tag() /mywebpath/wp-includes/shortcodes.php:197, referer: http://mywebsite/wp-admin/post.php?post=ccc&action=edit
PHP  11. call_user_func:{/mywebpath/wp-includes/shortcodes.php:286}() /mywebpath/wp-includes/shortcodes.php:286, referer: http://mywebsite/wp-admin/post.php?post=ccc&action=edit

[johnbillion]

Thanks for the report, Olivier!

Can you let us know how to reproduce this please? Which shortcode are you using? What does the shortcode callback function look like?

The warning sounds like you have a callback function hooked which doesn't actually exist. Can you double check the callback function name?

[olivier.pons]

Hi,

It's after a call to

remove_shortcode( 'anyshortcode' );

If I try to call "by hand"

do_shortcode( 'anyshortcode' )

(i.e.) the shortcode that I've just removed, I get this warning.

[SergeyBiryukov]

Replying to olivier.pons:

(i.e.) the shortcode that I've just removed, I get this warning.

I can't reproduce that. do_shortcode_tag() is only called for your shortcode if it's still a part of get_shortcode_regex() when do_shortcode()​ is called. Otherwise, the shortcode is just displayed as is.

[miqrogroove]

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