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 $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";

?>

参见

copy() - 拷贝文件

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User Contributed Notes 3 notes

down

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)

down

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.

down

-4

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;
    }

?>

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官方地址：https://www.php.net/manual/en/function.stream-copy-to-stream.php

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stream_copy_to_stream

说明

参数

返回值

更新日志

范例

参见

User Contributed Notes 3 notes