session_start
(PHP 4, PHP 5)
session_start — Initialize session data
Description
bool session_start
( void
)
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.
Return Values
This function always returns TRUE.
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:
If you are using cookie-based sessions, you must call
session_start() before anything is outputted to the
browser.
Note:
Use of zlib.output_compression
is recommended rather than ob_gzhandler()
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