Stream 函数
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stream_copy_to_stream

(PHP 5)

stream_copy_to_stream — Copies data from one stream to another

说明

int stream_copy_to_stream ( resource $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.

参数

source

The source stream

dest

The destination stream

maxlength

Maximum bytes to copy

offset

The offset where to start to copy data

返回值

Returns the total count of bytes copied.

更新日志

版本 说明
5.1.0 Added the offset parameter

范例

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";

?>

参见

Stream 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: Copies data from one stream to another

用户评论:

felix dot nensa at gmail dot com (27-May-2010 12:57)

As stream_copy_to_stream() seems to be quite a memory hog (at least in PHP 5.1.6 64-bit) it may be way more efficient just to copy streams with this simple PHP alternative:

<?php

    function pipe_streams($in, $out)
    {
        $size = 0;
        while (!feof($in)) $size += fwrite($out,fread($in,8192));
        return $size;
    }

?>

sundance2001 guess what gmail.com (25-Jul-2007 02:54)

If you need to copy a file from any website into yours you can use following function:

function getUrlContents($url)
{
   $url_parsed = parse_url($url);

   $host = $url_parsed["host"];
   if ($url == '' || $host == '') {
       return false;
   }
   $port = 80;
   $path = (empty($url_parsed["path"]) ? '/' : $url_parsed["path"]);
   $path.= (!empty($url_parsed["query"]) ? '?'.$url_parsed["query"] : '');
   $out = "GET $path HTTP/1.0\r\nHost: $host\r\nConnection: Close\r\n\r\n";
   $fp = fsockopen($host, $port, $errno, $errstr, 30);
   fwrite($fp, $out);
   $headers = '';
   $content = '';
   $buf = '';
   $isBody = false;
  while (!feof($fp) and !$isBody) {
          $buf = fgets($fp, 1024);
          if ($buf == "\r\n" ) {$isBody = true;}
          else{$headers .= $buf;}
          }
          $file1 = fopen(basename($url_parsed["path"]), 'w');
          $bytes=stream_copy_to_stream($fp,$file1);
   fclose($fp);
   return $bytes;
}

none at noone dot com (16-Jun-2007 12:27)

stream_copy_to_stream almost copies a stream...

$objInputStream = fopen("php://input", "rb");
$objTempStream = fopen("php://temp", "w+b");
stream_copy_to_stream($objInputStream, $objTempStream);

That code will copy a stream but it will also move the stream pointers to EOF.  This is fine if you plan on rewinding the temp stream but good luck rewinding the input stream.

rewind($objTempStream);
rewind($objInputStream);

So as you can see this is stream copy or stream move depending on what kind of stream you are working with, and because there are no peaking functions your effed if you need to read from an input stream in multiple classes that are unrelated.