使用pack填充空白符unpack解

<!--?php  
$book = array(array('Elmer Gantry', 'Sinclair Lewis', 1927),  
              array('The Scarlatti Inheritance', 'Robert Ludlum', '1971'),  
              array('The Parsifal Mosaic', 'William Styron', '1979'));  
$i = 0;  
foreach($book as $bookline){  
        $var[$i] = pack('A25A14A4', $bookline[0], $bookline[1], $bookline[2]);  
        $i++;  
}  
  
print_r ($var);  
  
for($i=0;$i<count($var); $i++){  
        $var[$i] = unpack('A25tit/A14aut/A4year', $var[$i]);  
}  
  
print_r ($var);  
echo $var[1]['tit'];  
?-->