stream_copy_to_stream
(PHP 5, PHP 7, PHP 8)
stream_copy_to_stream — Copies data from one stream to another
说明
stream_copy_to_stream(
resource
resource
?int
int
): int|false
resource
$from,resource
$to,?int
$length = null,int
$offset = 0): int|false
Makes a copy of up to length bytes
of data from the current position (or from the
offset position, if specified) in
from to to. If
length is null, all remaining content in
from will be copied.
参数
-
from -
The source stream
-
to -
The destination stream
-
length -
Maximum bytes to copy. By default all bytes left are copied.
-
offset -
The offset where to start to copy data
返回值
Returns the total count of bytes copied, 或者在失败时返回 false.
更新日志
| 版本 | 说明 |
|---|---|
| 8.0.0 |
length is now nullable.
|
范例
示例 #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";
?>
add a note
User Contributed Notes 3 notes
divinity76 at gmail dot com ¶
3 years ago
note that this function does not actually use sendfile() on linux systems (at least not in PHP 7.2.12)
none at noone dot com ¶
15 years ago
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($objInputStream);
So as you can see this is stream copy or stream move depending on what kind of stream you are working with, and because there are no peaking functions your effed if you need to read from an input stream in multiple classes that are unrelated.
felix dot nensa at gmail dot com ¶
12 years ago
As stream_copy_to_stream() seems to be quite a memory hog (at least in PHP 5.1.6 64-bit) it may be way more efficient just to copy streams with this simple PHP alternative:
<?php
function pipe_streams($in, $out)
{
$size = 0;
while (!feof($in)) $size += fwrite($out,fread($in,8192));
return $size;
}
?>
备份地址：http://www.lvesu.com/blog/php/function.stream-copy-to-stream.php