streamWrapper::stream_seek

(PHP 4 >= 4.3.2, PHP 5, PHP 7, PHP 8)

streamWrapper::stream_seek — Seeks to specific location in a stream

说明

public streamWrapper::stream_seek(int $offset, int $whence = SEEK_SET): bool

This method is called in response to fseek().

The read/write position of the stream should be updated according to the offset and whence.

参数

offset

The stream offset to seek to.

whence

Possible values:

SEEK_SET - Set position equal to offset bytes.
SEEK_CUR - Set position to current location plus offset.
SEEK_END - Set position to end-of-file plus offset.

注意: The current implementation never sets whence to SEEK_CUR; instead such seeks are internally converted to SEEK_SET seeks.

返回值

Return true if the position was updated, false otherwise.

注释

注意:
If not implemented, false is assumed as the return value.

注意:
Upon success, streamWrapper::stream_tell() is called directly after calling streamWrapper::stream_seek(). If streamWrapper::stream_tell() fails, the return value to the caller function will be set to false

注意:
Not all seeks operations on the stream will result in this function being called. PHP streams have read buffering enabled by default (see also stream_set_read_buffer()) and seeking may be done by merely moving the buffer pointer.

参见

fseek() - 在文件指针中定位

add a note

User Contributed Notes 1 note

down

fb at tigermedia dot dk ¶

8 years ago


Please notice that the return value of this function is a boolean but the return value of fseek is 0 for ok and -1 for failure.

Please use this implementation when working with files:

function stream_seek($offset, $whence) {
        if(0 === fseek($this->_handler, $offset, $whence)){
            return true;
        }
        return false;
}

add a note

官方地址：https://www.php.net/manual/en/streamwrapper.stream-seek.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 PHP获取指定函数定义在哪个文件中及行号 adodb连接mysql多个数据库的问题常用的php ADODB使用方法集锦 Packagist / Composer 中国全量镜像

略微加速

PHP官方手册 - 互联网笔记

streamWrapper::stream_seek

说明

参数

返回值

注释

参见

User Contributed Notes 1 note