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Task: Fix json encode Failing on UTF-8 Strings in PHP

Task: Fix json encode Failing on UTF-8 Strings in PHP: a task in Terminal-Lego-15k (Harbor dataset). When json encode() encounters strings with malformed UTF-8 characters (e.g., characters encoded in ISO-8859-1 or Windows-1252 that are not valid UTF-8), it returns false (or an empty string in…

The task

When `json_encode()` encounters strings with malformed UTF-8 characters (e.g., characters encoded in ISO-8859-1 or Windows-1252 that are not valid UTF-8), it returns `false` (or an empty string in older PHP versions) and sets the error `JSON_ERROR_UTF8`.

Part of PrimeIntellect/Terminal-Lego-15k.