public function add($chunk, $fileInfo = null, $index = 0, $mapLines = null){
		$this->strs[] = $chunk;
	}
public function add($chunk, $fileInfo = null, $index = 0, $mapLines = null){
		$this->strs[] = $chunk;
	}
public function add ( $ chunk , $ fileInfo = null , $ index = 0 , $ mapLines = null ) { $ this -> strs [ ] = $ chunk ; }
Adds a chunk to the stack

@param string $chunk The chunk to output
@param Less_FileInfo $fileInfo The file information
@param integer $index The index
@param mixed $mapLines
Adds a chunk to the stack