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
stream_get_contents
(PHP 5, PHP 7)
stream_get_contents — Reads remainder of a stream into a string
Descrição
stream_get_contents
( resource
$handle
[, int $maxlength = -1
[, int $offset = -1
]] ) : string|false
Identical to file_get_contents(), except that
stream_get_contents() operates on an already open
stream resource and returns the remaining contents in a string, up to
maxlength bytes and starting at the specified
offset.
Parâmetros
-
handle(resource) -
A stream resource (e.g. returned from fopen())
-
maxlength(int) -
The maximum bytes to read. Defaults to -1 (read all the remaining buffer).
-
offset(int) -
Seek to the specified offset before reading. If this number is negative, no seeking will occur and reading will start from the current position.
Valor Retornado
Returns a string ou false em caso de falha.
Exemplos
Exemplo #1 stream_get_contents() example
<?php
if ($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);
}
?>
Notas
Nota: Esta função é binary-safe.
Veja Também
- fgets() - Lê uma linha de um ponteiro de arquivo
- fread() - Leitura binary-safe de arquivo
- fpassthru() - Imprime todo os dados restantes de um ponteiro de arquivo
add a note
User Contributed Notes 5 notes
clarck dot smith at gmail dot com ¶
11 years ago
vasiliy at hotger dot com ¶
11 years ago
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.
m rahman ¶
12 years ago
When omitting the parameter $maxlength, any received bytes are stacked up until the underlying stream is not readable anymore, the the function returns that stack in one piece.
Mike Shiyan ¶
7 years ago
stream_get_contents() can be used instead of fread() even with local files.
divinity76+nospam at gmail dot com ¶
7 years ago
/*
* problem: stream_get_contents blocks / is very slow.
* I have tried
* 1: stream_set_blocking, doesn't make a difference.
* 2: stream_get_meta_data['unread_bytes'] = ITS BUGGED, ALWAYS SAYS 0.
* 3: feof(): ALSO EFFING BLOCKING
* 4: my_stream_get_contents hack... kinda working! :D
*/
function my_stream_get_contents ($handle, $timeout_seconds = 0.5)
{
$ret = "";
// feof ALSO BLOCKS:
// while(!feof($handle)){$ret.=stream_get_contents($handle,1);}
while (true) {
$starttime = microtime(true);
$new = stream_get_contents($handle, 1);
$endtime = microtime(true);
if (is_string($new) && strlen($new) >= 1) {
$ret .= $new;
}
$time_used = $endtime - $starttime;
// var_dump('time_used:',$time_used);
if (($time_used >= $timeout_seconds) || ! is_string($new) ||
(is_string($new) && strlen($new) < 1)) {
break;
}
}
return $ret;
}
