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session_start
Initialize session data
(PHP 4, PHP 5)
bool session_start ( )
session_start() creates a session or resumes the current one based on the current session id that's being passed via a request, such as GET, POST, or a cookie.
If you want to use a named session, you must call session_name() before calling session_start().
session_start() will register internal output handler
for URL rewriting when trans-sid is enabled. If a user
uses ob_gzhandler or like with
ob_start(), the order of output handler is important
for proper output. For example, user must register
ob_gzhandler before session start.
ChangeLog
| Version | Description |
|---|---|
| 4.3.3 |
As of now, calling session_start() while the
session has already been started will result in an error of level
E_NOTICE. Also, the second session start will
simply be ignored.
|
Examples
Example 2228. 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 2229. 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
If you are using cookie-based sessions, you must call session_start() before anything is outputted to the browser.
Use of zlib.output_compression is recommended rather than ob_gzhandler()
| $_SESSION |
| The session.auto_start configuration directive |
| session_id() |