stream_copy_to_stream

(PHP 5, PHP 7, PHP 8)

stream_copy_to_streamCopies data from one stream to another

Description

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.

Parameters

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

Return Values

Returns the total count of bytes copied, or false on failure.

Changelog

Version Description
8.0.0 length is now nullable.

Examples

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";

?>

See Also

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User Contributed Notes 2 notes

up
1
divinity76 at gmail dot com
5 years ago
note that this function does not actually use sendfile() on linux systems (at least not in PHP 7.2.12)
up
1
none at noone dot com
17 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.
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