# stream_bucket_prepend

(PHP 5, PHP 7)

stream_bucket_prepend — Prepend bucket to brigade

### 说明

stream_bucket_prepend ( resource `$brigade` , object `$bucket` ) : void

This function can be called to prepend a bucket to a bucket brigade. It is typically called from php_user_filter::filter().

### 参数

`brigade`

  `brigade` is a resource pointing to a bucket brigade which contains one or more bucket objects.

`bucket`

  A bucket object.

### 返回值

没有返回值。

### 范例

Example #1 stream_bucket_prepend() examples

    <?php

    class foo extends php_user_filter {
      protected $calls = 0;
      public function filter($in, $out, &$consumed, $closing) {
        while ($bucket = stream_bucket_make_writeable($in)) {
          $consumed += $bucket->datalen;
          if ($this->calls++ == 2) {
            // This bucket will appear again before any other bucket.
            stream_bucket_prepend($in, $bucket);
          }
        }
        return PSFS_FEED_ME;
      }
    }
    stream_filter_register('test', 'foo');
    print  file_get_contents('php://filter/read=test/resource=foo');
    ?>