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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 [, int offset]] )

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

例子 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

copy()

后退 | 起点 | 前进
stream_context_set_params | 上一级 | stream_filter_append