php中通过文件流的方式复制文件

[php]代码库

<?php 
    function stream_copy($src, $dest) 
    { 
        $fsrc = fopen($src,'r'); 
        $fdest = fopen($dest,'w+'); 
        $len = stream_copy_to_stream($fsrc,$fdest); 
        fclose($fsrc); 
        fclose($fdest); 
        return $len; 
    } 
?>