lib/Doctrine/Common/Lexer/AbstractLexer.php
public function moveNext()
    {
        $this->peek = 0;
        $this->token = $this->lookahead;
        $this->lookahead = (isset($this->tokens[$this->position]))
            ? $this->tokens[$this->position++] : null;

        return $this->lookahead !== null;
    }
public function moveNext()
    {
        $this->peek = 0;
        $this->token = $this->lookahead;
        $this->lookahead = (isset($this->tokens[$this->position]))
            ? $this->tokens[$this->position++] : null;

        return $this->lookahead !== null;
    }
Moves to the next token in the input string.

@return boolean