(PHP 5)
stream_copy_to_stream — Copies data from one stream to another
$source
   , resource $dest
   [, int $maxlength = -1
   [, int $offset = 0
  ]] )
   Makes a copy of up to maxlength bytes
   of data from the current position (or from the
   offset position, if specified) in
   source to dest. If
   maxlength is not specified, all remaining content in
   source will be copied.
  
source
     The source stream
dest
     The destination stream
maxlength
     Maximum bytes to copy
offset
     The offset where to start to copy data
Returns the total count of bytes copied.
| 版本 | 说明 | 
|---|---|
| 5.1.0 | 
        Added the offset parameter
        | 
      
Example #1 A stream_copy_to_stream() example
<?php
$src = fopen('http://www.example.com', 'r');
$dest1 = fopen('first1k.txt', 'w');
$dest2 = fopen('remainder.txt', 'w');
echo stream_copy_to_stream($src, $dest1, 1024) . " bytes copied to first1k.txt\n";
echo stream_copy_to_stream($src, $dest2) . " bytes copied to remainder.txt\n";
?>