Stream Functions
PHP Manual

stream_set_write_buffer

Sets write file buffering on the given stream

Description

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.

Parameters

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.

Return Values

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

Examples

Example #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 ($fp) {
  stream_set_write_buffer($fp, 0);
  fwrite($fp, $output);
  fclose($fp);
}
?>

See Also

  • fopen
  • fwrite