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  • 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

    • fopen() 打开文件或者 URL
    • fwrite() 写入文件(可安全用于二进制文件)
    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
    }