/**
  * (non-PHPdoc)
  * @see AbstractBbcodeNode::toHtml()
  */
 public function toHtml()
 {
     if ($this->isEmpty()) {
         return '';
     }
     return '<td>' . parent::childrenString() . '</td>';
 }
 /**
  * (non-PHPdoc)
  * @see AbstractBbcodeNode::toString()
  */
 public function toString()
 {
     if ($this->isEmpty()) {
         return '';
     }
     return '[left]' . parent::childrenString() . '[/left]';
 }
 /**
  * (non-PHPdoc)
  * @see AbstractBbcodeNode::toString()
  */
 public function toString()
 {
     if ($this->isEmpty()) {
         return '';
     }
     if ($this->_title === null) {
         return '[spoiler]' . parent::childrenString() . '[/spoiler]';
     }
     return '[spoiler=' . $this->_title . ']' . parent::childrenString() . '[/spoiler]';
 }
 /**
  * (non-PHPdoc)
  * @see AbstractBbcodeNode::toString()
  */
 public function toString()
 {
     if ($this->isEmpty()) {
         return '';
     }
     if ($this->_author === null) {
         return '[quote]' . parent::childrenString() . '[/quote]';
     }
     return '[quote=' . $this->_author . ']' . parent::childrenString() . '[/quote]';
 }
 /**
  * (non-PHPdoc)
  * @see AbstractBbcodeNode::toString()
  */
 public function toString()
 {
     if ($this->isEmpty()) {
         return '';
     }
     if ($this->_color === null) {
         return parent::childrenString();
     }
     return '[color=' . $this->_color . ']' . parent::childrenString() . '[/color]';
 }
 /**
  * (non-PHPdoc)
  * @see AbstractBbcodeNode::toString()
  */
 public function toString()
 {
     if ($this->isEmpty()) {
         return '';
     }
     if ($this->_size === null) {
         return parent::childrenString();
     }
     return '[size=' . $this->_size . ']' . parent::childrenString() . '[/size]';
 }
 /**
  * Gets correctly formed bbcode from this subtree.
  *
  * @return string
  */
 public function toString()
 {
     if ($this->isEmpty()) {
         return "";
     }
     if (count(parent::getChildren()) === 0) {
         return '[url]' . $this->_target_url . '[/url]';
     } else {
         return '[url=' . $this->_target_url . ']' . parent::childrenString() . '[/url]';
     }
 }