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Opened 3 years ago

#53023 new defect (bug)

_wp_json_convert_string type mismatch: returns string on success; false on failure

Reported by: hellofromtonya's profile hellofromTonya Owned by:
Milestone: Awaiting Review Priority: normal
Severity: normal Version: 4.1.4
Component: Formatting Keywords:
Focuses: docs Cc:


The private function _wp_json_convert_string (which converts a string to UTF-8) also returns false, though its @return specifies only string.

How? `mb_convert_encoding` returns a string on success and a false on failure.

Is this a bug or docs fix? It's both.

Reviewing its context, it's used by _wp_json_sanity_check to convert IDs and data value. The IDs are the problem. How so? Each ID is used as either a key or project for referencing the data value.

What happens if the conversion to UTF-8 fails? The key or property would either be an empty string or false. That's problematic as it can cause unexpected JSON encoding results.

For example, this 3v4l snippet simulates the convert encoding failure to view the results through the JSON encoding process. Notice how the returned JSON is invalid when it fails. (Note: This snippet is forcing a failure.)

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