code: public function validate()
  	{
  		$mandatory = $this->mandatory;
  		$options = $this->getPost($this->strName);
  
  		// Check labels only (values can be empty)
  		if (\is_array($options))
  		{
  			foreach ($options as $key=>$option)
  			{
  				// Unset empty rows
  				if ($option['label'] == '')
  				{
  					unset($options[$key]);
  					continue;
  				}
  
  				$options[$key]['label'] = trim($option['label']);
  				$options[$key]['value'] = trim($option['value']);
  
  				if ($options[$key]['label'] != '')
  				{
  					$this->mandatory = false;
  				}
  
  				// Strip double quotes (see #6919)
  				if ($options[$key]['value'] != '')
  				{
  					$options[$key]['value'] = str_replace('"', '', $options[$key]['value']);
  				}
  			}
  		}
  
  		$options = array_values($options);
  		$varInput = $this->validator($options);
  
  		if (!$this->hasErrors())
  		{
  			$this->varValue = $varInput;
  		}
  
  		// Reset the property
  		if ($mandatory)
  		{
  			$this->mandatory = true;
  		}
  	}
docs: Validate the input and set the value