stream_get_contents
(PHP 5)
stream_get_contents — Reads remainder of a stream into a string
Description
string stream_get_contents
( resource $handle
[, int $maxlength
[, int $offset
]] )
Identical to file_get_contents(), except that stream_get_contents() operates on an already open stream resource and returns the remaining contents in a string, up to maxlength bytes and starting at the specified offset .
Список параметров
Возвращаемые значения
Returns a string, or FALSE on failure.
Примеры
Пример #1 stream_get_contents() example
<?php
if ($stream = fopen('http://www.example.com', 'r')) {
// print all the page starting at the offset 10
echo stream_get_contents($stream, -1, 10);
fclose($stream);
}
if ($stream = fopen('http://www.example.net', 'r')) {
// print the first 5 bytes
echo stream_get_contents($stream, 5);
fclose($stream);
}
?>
Смотрите также
Замечание: Эта функция безопасна для обработки данных в двоичной форме.
- PHP Руководство
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- Потоки
- set_socket_blocking
- stream_bucket_append
- stream_bucket_make_writeable
- stream_bucket_new
- stream_bucket_prepend
- stream_context_create
- stream_context_get_default
- stream_context_get_options
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- stream_get_contents
- stream_get_filters
- stream_get_line
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- stream_supports_lock
- stream_wrapper_register
- stream_wrapper_restore
- stream_wrapper_unregister
Коментарии
When omitting the parameter $maxlength, any received bytes are stacked up until the underlying stream is not readable anymore, the the function returns that stack in one piece.In that case when stream_get_contents/fread/fgets or other stream reading functions block indefinitely your script because they don't reached the limit of bytes to read use the socket_get_meta_data function to figure out the number of the bytes to read. It returns an array that contains a key named 'unread_bytes' and then pass that number to your favourite stream reading functions second parameter to read from the stream.
Maybe a good workaround to use the stream_select function, and set the socket to non-blocking mode with the use of stream_set_blocking($stream, 0). In this case the socket reading functions work properly.
Cheers, Ervin
It is important to know that stream_get_contents behaves differently with different versions of PHP. Consider the following
<?php
$handle = fopen('file', 'w+'); // truncate + attempt to create
fwrite($handle, '12345'); // file position > 0
rewind($handle); // position = 0
$content = stream_get_contents($handle); // file position = 0 in PHP 5.1.6, file position > 0 in PHP 5.2.17!
fwrite($handle, '6789');
fclose($handle);
/**
*
* 'file' content
*
* PHP 5.1.6:
* 67895
*
* PHP 5.2.17:
* 123456789
*
*/
?>
As a result, stream_get_contents() affects file position in 5.1, and do not affect file position in 5.2 or better.
It states that $length parameter which value is null is intended to read all remaining contents from $stream
However, example listed under docs uses -1 as $length parameter to achieve such behavior
Recently i had to start few commands from php7.4 and read content from them, proc_open was used to create processes.
Both output[1] and error[2] pipes were set to non-blocking mode. For some unknown reason sometimes process error[2] channel was available, sometimes not(it was empty string).
After some investigation it was found that stream_get_contents works just great with -1 as a $length value instead of null if you are trying to get all remaining buffer.