(PHP 4 >= 4.3.0, PHP 5, PHP 7)
stream_set_write_buffer — Sets write file buffering on the given stream
stream_set_write_buffer ( resource $stream , int $buffer ) : int
Sets the buffering for write operations on the given stream
to buffer
bytes.
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.
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); } ?>
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https://www.php.net/manual/en/function.stream-set-write-buffer.php