session_start函数

session_start函数session_start(PHP4,PHP5)session_start — InitializesessiondataReportabug Descriptionbool session_start ( void )s

大家好,欢迎来到IT知识分享网。session_start函数

session_start

(PHP 4, PHP 5)

session_start — Initialize session data

 Description

bool 
session_start ( 
void )

session_start() creates a session or resumes the current one based on a session identifier passed via a GET or POST request, or passed via a cookie.

To use a named session, call session_name() before calling session_start().

When session.use_trans_sid is enabled, the session_start() function will register an internal output handler for URL rewriting.

If a user uses ob_gzhandler or similar with ob_start(), the function order is important for proper output. For example, ob_gzhandlermust be registered before starting the session.

 Return Values

This function returns TRUE if a session was successfully started, otherwise FALSE.

 Changelog

Version Description
5.3.0 If a session fails to start, then FALSE is returned. Previously TRUE was returned.
4.3.3 As of PHP 4.3.3, calling session_start() after the session was previously started will result in an error of level E_NOTICE. Also, the second session start will simply be ignored.

 Examples

Example #1 A session example: page1.php

<?php
// page1.php

session_start();

echo 'Welcome to page #1';

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

// Works if session cookie was accepted
echo '<br /><a href="page2.php">page 2</a>';

// Or maybe pass along the session id, if needed
echo '<br /><a href="page2.php?' SID '">page 2</a>';
?>

After viewing page1.php, the second page page2.php will magically contain the session data. Read the session reference for information on propagating session ids as it, for example, explains what the constant SID is all about.

Example #2 A session example: 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']);

// You may want to use SID here, like we did in page1.php
echo '<br /><a href="page1.php">page 1</a>';
?>

 Notes

Note:

To use cookie-based sessions, session_start() must be called before outputing anything to the browser.

Note:

Use of zlib.output_compression is recommended instead of ob_gzhandler()

Note:

This function sends out several HTTP headers depending on the configuration. See session_cache_limiter() to customize these headers.

 See Also

免责声明:本站所有文章内容,图片,视频等均是来源于用户投稿和互联网及文摘转载整编而成,不代表本站观点,不承担相关法律责任。其著作权各归其原作者或其出版社所有。如发现本站有涉嫌抄袭侵权/违法违规的内容,侵犯到您的权益,请在线联系站长,一经查实,本站将立刻删除。 本文来自网络,若有侵权,请联系删除,如若转载,请注明出处:https://yundeesoft.com/22473.html

(0)

相关推荐

发表回复

您的邮箱地址不会被公开。 必填项已用 * 标注

关注微信