src/Tokenizer/TokensAnalyzer.php
public function isLambda($index)
    {
        if (!$this->tokens[$index]->isGivenKind(T_FUNCTION)) {
            throw new \LogicException(sprintf('No T_FUNCTION at given index %d, got %s.', $index, $this->tokens[$index]->getName()));
        }

        $startParenthesisIndex = $this->tokens->getNextMeaningfulToken($index);
        $startParenthesisToken = $this->tokens[$startParenthesisIndex];

        // skip & for `function & () {}` syntax
        if ($startParenthesisToken->isGivenKind(CT::T_RETURN_REF)) {
            $startParenthesisIndex = $this->tokens->getNextMeaningfulToken($startParenthesisIndex);
            $startParenthesisToken = $this->tokens[$startParenthesisIndex];
        }

        return $startParenthesisToken->equals('(');
    }
public function isLambda($index)
    {
        if (!$this->tokens[$index]->isGivenKind(T_FUNCTION)) {
            throw new \LogicException(sprintf('No T_FUNCTION at given index %d, got %s.', $index, $this->tokens[$index]->getName()));
        }

        $startParenthesisIndex = $this->tokens->getNextMeaningfulToken($index);
        $startParenthesisToken = $this->tokens[$startParenthesisIndex];

        // skip & for `function & () {}` syntax
        if ($startParenthesisToken->isGivenKind(CT::T_RETURN_REF)) {
            $startParenthesisIndex = $this->tokens->getNextMeaningfulToken($startParenthesisIndex);
            $startParenthesisToken = $this->tokens[$startParenthesisIndex];
        }

        return $startParenthesisToken->equals('(');
    }
Check if the function under given index is a lambda.

@param int $index

@return bool