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Stream 过滤

filter 是在流中执行读取或写入数据操作时的最后一段代码。可以将任意数量的过滤器堆叠到一个流上。可以在 PHP 脚本中使用 stream_filter_register() 或扩展定义自定义过滤器。要访问当前注册的过滤器列表，请使用 stream_get_filters()。