code: protected function parseHeader($curl, $header)
  	{
  		if (preg_match("/^([^:\s]+)\:\s+(.*)$/", $header, $matches))
  		{
  			// Add to header list
  			$matches[2] = trim($matches[2]);
  			$this->lastHeader[$matches[1]] = $matches[2];
  
  			// Set result type
  			$this->lastResultType = $matches[1] === "Content-Type" ? $matches[2] : $this->lastResultType;			
  		}
  
  		return strlen($header);
  	}
docs: Parse header line
  
  @param resource	$curl	curl resource
  @param string	$header	header line
  
  @return int