(PECL parle >= 0.8.4)
Parle\RParser::sigilName — Retrieve a rule or token name
public Parle\RParser::sigilName(int $idx): string
Retrieve a partial rule name or token name corresponding to the sigil index.
idxMatch index, zero based.
Returns a string with the matched part.
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https://www.php.net/manual/en/parle-rparser.sigilname.php