Hướng dẫn stream_copy_to_stream php

(PHP 5, PHP 7, PHP 8)

stream_copy_to_stream — Copies data from one stream to another

Description

stream_copy_to_stream(
    resource $from,
    resource $to,
    ?int $length = null,
    int $offset = 0
): int|false

Parameters

The source stream

The destination stream

Maximum bytes to copy. By default all bytes left are copied.

The offset where to start to copy data

Return Values

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

Changelog

Examples

Example #1 A stream_copy_to_stream() example

$src = fopen('http://www.example.com', 'r');
$dest1 = fopen('first1k.txt', 'w');
$dest2 = fopen('remainder.txt', 'w');

echo

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:

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

(PHP 5, PHP 7, PHP 8)

stream_copy_to_stream — Copie des données depuis un flux vers un autre

Description

stream_copy_to_stream(
    resource $from,
    resource $to,
    ?int $length = null,
    int $offset = 0
): int|false

Liste de paramètres

Le flux de source

Le flux de destination

Nombre maximal d'octets à copier. Par défaut, tous les octets restants sont copiés.

L'offset où démarrer la copie de données

Valeurs de retour

Retourne le nombre total d'octets copiés, ou false si une erreur survient.

Historique

Exemples

Exemple #1 Exemple avec stream_copy_to_stream()

$src = fopen('http://www.example.com', 'r');
$dest1 = fopen('first1k.txt', 'w');
$dest2 = fopen('remainder.txt', 'w');

echo

Voir aussi

• copy() - Copie un fichier

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:

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