Syntax
bool
session_start ( void )
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.
This function always returns TRUE.
Note:
If you are using cookie-based sessions, you must call
session_start() before anything is outputted to the
browser.
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>';
?>
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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>';
?>
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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.
Note:
As of PHP 4.3.3, 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.
See also
$_SESSION,
session.auto_start, and
session_id().