(PHP 4 >= 4.3.0, PHP 5, PHP 7)
stream_set_write_buffer — Sets write file buffering on the given stream
$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.
streamThe 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.
Returns 0 on success, or another value if the request cannot be honored.
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 ($fp) {
if (stream_set_write_buffer($fp, 0) !== 0) {
// changing the buffering failed
}
fwrite($fp, $output);
fclose($fp);
}
?>