stream_set_write_buffer()
(PHP 4 >= 4.3.0, PHP 5, PHP 7)
Sets write file buffering on the given stream
说明
stream_set_write_buffer(resource $stream,int $buffer): int
Sets the buffering for write operations on the given$streamto$bufferbytes.
参数
- $stream
The file pointer.
- $buffer
The number of bytes to buffer.If$bufferis 0 then write operations are unbuffered. This ensures that all writes withfwrite()are completed before other processes are allowed to write to that output stream.
返回值
Returns 0 on success, or another value if the request cannot be honored.
范例
Example #1stream_set_write_buffer()example
The following example demonstrates how to usestream_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); } ?>
参见
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 }