session_start

(PHP 4, PHP 5, PHP 7)

session_start — 锟斤拷锟斤拷锟铰会话锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟叫会话

说锟斤拷

session_start ([ array $options = array() ] ) : bool

session_start() 锟结创锟斤拷锟铰会话锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟叫会话锟斤拷 锟斤拷锟酵拷锟� GET 锟斤拷锟斤拷 POST 锟斤拷式锟斤拷锟斤拷锟斤拷使锟斤拷 cookie 锟结交锟剿会话 ID锟斤拷 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷谢峄帮拷锟�

锟斤拷锟结话锟皆讹拷锟斤拷始锟斤拷锟斤拷通锟斤拷 session_start() 锟街讹拷锟斤拷始锟斤拷时锟斤拷 PHP 锟节诧拷锟斤拷锟斤拷没峄帮拷锟斤拷锟斤拷锟斤拷锟� open 锟斤拷 read 锟截碉拷锟斤拷锟斤拷锟斤拷 锟结话锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 PHP 默锟较的ｏ拷 也锟斤拷锟斤拷锟斤拷锟斤拷展锟结供锟侥ｏ拷SQLite 锟斤拷锟斤拷 Memcached 锟斤拷展锟斤拷锟斤拷 也锟斤拷锟斤拷锟斤拷通锟斤拷 session_set_save_handler() 锟借定锟斤拷锟矫伙拷锟皆讹拷锟斤拷峄帮拷锟斤拷锟斤拷锟斤拷锟� 通锟斤拷 read 锟截碉拷锟斤拷锟斤拷锟斤拷锟截碉拷锟斤拷锟叫会话锟斤拷锟捷ｏ拷使锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷谢锟斤拷锟绞斤拷娲拷锟斤拷锟� PHP 锟斤拷锟皆讹拷锟斤拷锟斤拷锟叫伙拷锟斤拷锟捷诧拷锟斤拷锟斤拷锟� $_SESSION 锟斤拷锟斤拷全锟街憋拷锟斤拷锟斤拷

要锟斤拷使锟斤拷锟斤拷锟斤拷锟结话锟斤拷锟斤拷锟节碉拷锟斤拷 session_start() 锟斤拷锟斤拷 之前锟斤拷锟斤拷 session_name() 锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷锟� session.use_trans_sid 选锟筋， session_start() 锟斤拷锟斤拷锟斤拷注锟斤拷一锟斤拷锟节诧拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟� 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 URL 锟斤拷写锟侥癸拷锟斤拷锟斤拷

锟斤拷锟斤拷没锟斤拷锟斤拷锟绞癸拷锟� ob_start() 锟斤拷 ob_gzhandler 锟斤拷锟斤拷锟斤拷 锟斤拷么锟斤拷锟斤拷锟侥碉拷锟斤拷顺锟斤拷锟接帮拷锟斤拷锟斤拷锟斤拷锟斤拷锟� 锟斤拷锟界，锟斤拷锟斤拷锟节匡拷始锟结话之前锟斤拷锟斤拷 ob_gzhandler 锟斤拷锟斤拷锟斤拷锟阶拷帷�

锟斤拷锟斤拷

options

锟剿诧拷锟斤拷锟斤拷一锟斤拷锟斤拷锟斤拷锟斤拷锟介，锟斤拷锟斤拷峁╋拷锟斤拷锟矫达拷锟斤拷锟斤拷锟斤拷械锟斤拷锟侥匡拷锟斤拷锟� 锟结话锟斤拷锟斤拷指示 锟叫碉拷锟斤拷锟斤拷锟筋。锟斤拷锟斤拷锟斤拷锟叫的硷拷锟斤拷锟斤拷锟斤拷锟� session. 前缀锟斤拷

锟斤拷锟剿筹拷锟斤拷幕峄帮拷锟斤拷锟街甘撅拷睿� 锟斤拷锟斤拷锟斤拷锟节达拷锟斤拷锟斤拷锟叫帮拷锟斤拷 read_and_close 选锟筋。锟斤拷锟斤拷锟斤拷锟窖★拷锟斤拷值锟斤拷锟斤拷为 TRUE锟斤拷 锟斤拷么锟结话锟侥硷拷锟斤拷锟节讹拷取锟斤拷锟街拷锟斤拷锟斤拷瞎乇眨锟� 锟斤拷耍锟斤拷锟斤拷锟斤拷诨峄帮拷锟斤拷锟矫伙拷斜涠拷锟绞憋拷颍锟斤拷獠伙拷锟揭拷锟斤拷募锟斤拷锟斤拷锟�

锟斤拷锟斤拷值

锟缴癸拷锟斤拷始锟结话锟斤拷锟斤拷 TRUE 锟斤拷锟斤拷之锟斤拷锟斤拷 FALSE

锟斤拷锟斤拷锟斤拷志

锟芥本 说锟斤拷
7.1.0 锟斤拷 session_start() 执锟斤拷失锟杰ｏ拷 锟睫凤拷锟斤拷始一锟斤拷锟结话锟斤拷时锟津，会返锟斤拷 FALSE锟斤拷 锟斤拷锟揭诧拷锟斤拷锟绞硷拷锟斤拷锟斤拷锟斤拷锟斤拷锟� $_SESSION锟斤拷
7.0.0 锟铰硷拷 options 锟斤拷锟斤拷锟斤拷
5.3.0 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟绞э拷芊锟斤拷锟� FALSE锟斤拷 之前锟芥本锟斤拷锟斤拷锟斤拷 TRUE锟斤拷
4.3.3 锟斤拷 PHP 4.3.3 锟叫ｏ拷 锟结话锟斤拷始之锟斤拷锟斤拷锟� session_start() 锟斤拷锟斤拷 锟斤拷锟斤拷锟斤拷 E_NOTICE 锟斤拷锟斤拷拇锟斤拷锟� 锟斤拷锟揭第讹拷锟斤拷锟斤拷锟斤拷始锟结话锟侥碉拷锟矫会被锟斤拷锟皆★拷

锟斤拷锟斤拷

锟斤拷锟斤拷锟侥会话示锟斤拷

Example #1 page1.php

<?php
// page1.php

session_start();

echo 'Welcome to page #1';

$_SESSION['favcolor'] = 'green';
$_SESSION['animal']   = 'cat';
$_SESSION['time']     = time();

// 锟斤拷锟绞癸拷锟� cookie 锟斤拷式锟斤拷锟酵会话 ID
echo '<br /><a href="page2.php">page 2</a>';

// 锟斤拷锟斤拷锟斤拷锟绞癸拷锟� cookie 锟斤拷式锟斤拷锟酵会话 ID锟斤拷锟斤拷使锟斤拷 URL 锟斤拷写锟侥凤拷式锟斤拷锟酵会话 ID
echo '<br /><a href="page2.php?' . SID . '">page 2</a>';
?>

锟斤拷锟斤拷 page1.php 页锟斤拷之锟斤拷 锟节讹拷锟斤拷页锟斤拷 page2.php 锟斤拷锟斤拷锟斤拷峄帮拷锟斤拷荨锟� 锟斤拷锟斤拷锟� 锟结话锟轿匡拷 锟斤拷取锟斤拷锟斤拷锟斤拷锟� 锟结话 ID 锟斤拷锟斤拷锟斤拷锟斤拷息锟斤拷 锟节该参匡拷页锟斤拷锟斤拷锟叫癸拷锟节筹拷锟斤拷 SID 锟斤拷锟斤拷细说锟斤拷锟斤拷

Example #2 page2.php

<?php
// page2.php

session_start();

echo 'Welcome to page #2<br />';

echo $_SESSION['favcolor']; // green
echo $_SESSION['animal'];   // cat
echo date('Y m d H:i:s', $_SESSION['time']);

// 锟斤拷锟斤拷 page1.php 锟叫的达拷锟诫，锟斤拷锟斤拷锟斤拷锟揭拷锟斤拷锟斤拷锎︼拷锟绞癸拷锟� SID 锟侥筹拷锟斤拷
echo '<br /><a href="page1.php">page 1</a>';
?>

锟斤拷锟斤拷 session_start() 锟斤拷时锟斤拷指锟斤拷选锟斤拷

Example #3 锟斤拷锟斤拷 Cookie 锟斤拷时时锟斤拷锟借定

<?php
// 锟斤拷锟斤拷 cookie 锟斤拷锟斤拷效时锟斤拷为 1 锟斤拷
session_start([
    'cookie_lifetime' => 86400,
]);
?>

Example #4 锟斤拷取锟结话之锟斤拷锟斤拷锟斤拷锟截闭会话锟芥储锟侥硷拷

<?php
// 锟斤拷锟饺凤拷锟斤拷锟斤拷薷幕峄帮拷械锟斤拷锟斤拷荩锟�
// 锟斤拷锟角匡拷锟斤拷锟节会话锟侥硷拷锟斤拷取锟斤拷锟街拷锟斤拷锟斤拷锟斤拷乇锟斤拷锟�
// 锟斤拷锟斤拷锟斤拷锟斤拷锟节革拷锟结话锟侥硷拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷页锟斤拷锟斤拷锟斤拷
session_start([
    'cookie_lifetime' => 86400,
    'read_and_close'  => true,
]);

注锟斤拷

Note:

要使锟矫伙拷锟斤拷 cookie 锟侥会话锟斤拷 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟绞贾帮拷锟斤拷锟� session_start() 锟斤拷锟斤拷锟斤拷

Note:

锟斤拷锟斤拷使锟斤拷 zlib.output_compression 锟斤拷锟斤拷锟� ob_gzhandler()锟斤拷

Note:

锟斤拷锟斤拷锟斤拷锟矫诧拷同锟斤拷锟斤拷锟斤拷锟斤拷锟结发锟酵硷拷锟斤拷 HTTP 锟斤拷应头锟斤拷 锟轿匡拷 session_cache_limiter() 锟斤拷锟皆讹拷锟斤拷 HTTP 锟斤拷应头锟斤拷

锟轿硷拷