stream_filter_prepend

(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

stream_filter_prepend — Attach a filter to a stream

说明

stream_filter_prepend(
    resource $stream,
    string $filtername,
    int $read_write = ?,
    mixed $params = ?
): resource

Adds filtername to the list of filters attached to stream.

参数

stream: The target stream.
filtername: The filter name.
read_write: By default, stream_filter_prepend() will attach the filter to the read filter chain if the file was opened for reading (i.e. File Mode: r, and/or +). The filter will also be attached to the write filter chain if the file was opened for writing (i.e. File Mode: w, a, and/or +). STREAM_FILTER_READ, STREAM_FILTER_WRITE, and/or STREAM_FILTER_ALL can also be passed to the read_write parameter to override this behavior. See stream_filter_append() for an example of using this parameter.
params: This filter will be added with the specified params to the beginning of the list and will therefore be called first during stream operations. To add a filter to the end of the list, use stream_filter_append().

返回值

Returns a resource on success or false on failure. The resource can be used to refer to this filter instance during a call to stream_filter_remove().

false is returned if stream is not a resource or if filtername cannot be located.

注释

注意: When using custom (user) filters
stream_filter_register() must be called first in order to register the desired user filter to filtername.

注意: Stream data is read from resources (both local and remote) in chunks, with any unconsumed data kept in internal buffers. When a new filter is prepended to a stream, data in the internal buffers, which has already been processed through other filters will not be reprocessed through the new filter at that time. This differs from the behavior of stream_filter_append().

注意: When a filter is added for read and write, two instances of the filter are created. stream_filter_prepend() must be called twice with STREAM_FILTER_READ and STREAM_FILTER_WRITE to get both filter resources.

参见

stream_filter_register() - Register a user defined stream filter
stream_filter_append() - Attach a filter to a stream

add a note

User Contributed Notes

There are no user contributed notes for this page.

官方地址：https://www.php.net/manual/en/function.stream-filter-prepend.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络 JAVA NoSQL 数据库面试 C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet ADORecordSet对象 adodb手册 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 opcache预加载 Composer的Packagist资源 mysql面试题 [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式 PHP7添加redis扩展 PHP mkdir()写出来的权限与mode值不符合 Packagist / Composer 中国全量镜像 [原创]诡异的php-fpm超时问题 php中几种注释规范支持php7的性能采集扩展

略微加速

PHP官方手册 - 互联网笔记

stream_filter_prepend

说明

参数

返回值

注释

参见

User Contributed Notes