Opened 13 years ago
Closed 11 years ago
#19927 closed defect (bug) (duplicate)
Improve support escaping a shortcode tag
| Reported by: |
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Owned by: | |
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| Milestone: | Priority: | normal | |
| Severity: | normal | Version: | 3.3.1 |
| Component: | Shortcodes | Keywords: | has-patch needs-testing |
| Focuses: | Cc: |
Description (last modified by )
In do_shortcode_tag() there is some code that allows a shortcode to be escaped. It is commented with
// allow [[foo]] syntax for escaping a tag
This code is fine if do_shortcode() is only invoked once on a particular chunk of data.
But if the code is run more than once then the 'escaped' shortcode once again gets selected for processing and the shortcode is expanded.
e.g. [ [ caption ] ] will be 'escaped' to [ caption ] which then gets processed.
Although this multiple invocation does not normally happen in vanilla WordPress, it is very easy to cause it to occur.
In my case I noticed the problem since I had added the filter for 'the_content' with a different priority from the WordPress default.
e.g. add_filter( 'the_content', 'do_shortcode'); I'd missed the '11'.
Having removed that offending line of code I then discovered that Artisteer generated themes call get_the_excerpt() as well as the_excerpt() AND I'd added do_shortcode for both these filters.
The fix is simple. Instead of simply removing the outer square brackets, ensure that the first left square bracket is the escaped character [
patch for ticket #19927 - use [ instead of '[' to prevent further shortcode expansion