convert_smilies() fails on large tags

[podpirate]

I have an image with huge data-url src (1.6M) in the post content.
The post content is not displayed, but (with WP_DEBUG on) there is a php error instead.

PHP Error output:

 Warning: count(): Parameter must be an array or an object that implements Countable in /Users/joern/www/vhosts/wordpress.local/httpdocs/stable/wp-includes/formatting.php on line 3357

Som digging revealed, that preg_split() in function convert_smilies() fails with a PREG_RECURSION_LIMIT_ERROR.

IMHO there should a check for preg_last_error() whether preg_split() was successfull, and if not the function should just return its input.

Any thoughts on this?
I'd be happy to craft a patch.

[SergeyBiryukov]

Hi there, welcome back to WordPress Trac! Thanks for the ticket.

IMHO there should a check for preg_last_error() whether preg_split() was successfull, and if not the function should just return its input.

Makes sense to me :)

…o avoid issues in ticket #51019

Use preg_last_error() inside convert_smilies() to check for any preg_split errors before running count().
If there are errors, sends a PHP warning with the error message, then returns the original text.

Running count() on the array after there are preg_split errors can cause post content to not display (see ticket).

Trac ticket: https://core.trac.wordpress.org/ticket/51019

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Use preg_last_error() inside convert_smilies() to check for any preg_split errors before running count().
If there are errors, sends a PHP warning with the error message, then returns the original text.

Running count() on the array after there are preg_split errors can cause post content to not display (see ticket).

This is a reformat of a previous pull request to get the PHP tests to pass.

Trac ticket: https://core.trac.wordpress.org/ticket/51019

Same, +1 Up 🙌

Is there any ETA on this..?

[rupw]

FWIW I'd probably just check $textarr === false rather than preg_last_error(), but looks good to me.

Another report on WPSE: ​https://wordpress.stackexchange.com/q/409084