stream_set_write_buffer

(PHP 4 >= 4.3.0, PHP 5)

stream_set_write_bufferSets write file buffering on the given stream

Опис

int stream_set_write_buffer ( resource $stream , int $buffer )

Sets the buffering for write operations on the given stream to buffer bytes.

Output using fwrite() is normally buffered at 8K. This means that if there are two processes wanting to write to the same output stream (a file), each is paused after 8K of data to allow the other to write.

Параметри

stream

The file pointer.

buffer

The number of bytes to buffer. If buffer is 0 then write operations are unbuffered. This ensures that all writes with fwrite() are completed before other processes are allowed to write to that output stream.

Значення, що повертаються

Returns 0 on success, or another value if the request cannot be honored.

Приклади

Приклад #1 stream_set_write_buffer() example

The following example demonstrates how to use stream_set_write_buffer() to create an unbuffered stream.

<?php
$fp 
fopen($file"w");
if (
$fp) {
  if (
stream_set_write_buffer($fp0) !== 0) {
      
// changing the buffering failed
  
}
  
fwrite($fp$output);
  
fclose($fp);
}
?>

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User Contributed Notes 1 note

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1
kevin at bonnevillessei dot com
4 years ago
Trying to use stream_set_write_buffer on a local file will always fail according to this note from 2003.

http://grokbase.com/t/php/php-internals/0351gp6xtn/stream-set-write-buffer-does-not-work

Example:

$fp = fopen("localfile.txt", "w");
if (stream_set_write_buffer($fp, 0) !== 0) {
    // changing the buffering failed is always true on local files
}
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