src/Tokenizer/Token.php
public function setContent($content)
    {
        @trigger_error(__METHOD__.' is deprecated and will be removed in 3.0.', E_USER_DEPRECATED);
        Tokens::setLegacyMode(true);

        if ($this->content === $content) {
            return;
        }

        $this->changed = true;
        $this->content = $content;

        // setting empty content is clearing the token
        if ('' === $content) {
            @trigger_error(__METHOD__.' shall not be used to clear token, use Tokens::clearAt instead.', E_USER_DEPRECATED);
            $this->id = null;
            $this->isArray = false;
        }
    }
public function setContent($content)
    {
        @trigger_error(__METHOD__.' is deprecated and will be removed in 3.0.', E_USER_DEPRECATED);
        Tokens::setLegacyMode(true);

        if ($this->content === $content) {
            return;
        }

        $this->changed = true;
        $this->content = $content;

        // setting empty content is clearing the token
        if ('' === $content) {
            @trigger_error(__METHOD__.' shall not be used to clear token, use Tokens::clearAt instead.', E_USER_DEPRECATED);
            $this->id = null;
            $this->isArray = false;
        }
    }
@param string $content

@deprecated since 2.4