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session_startStart new or resume existing session Description
bool session_start
([ array
$options = []
] )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. When session_start is called or when a session auto starts, PHP will call the open and read session save handlers. These will either be a built-in save handler provided by default or by PHP extensions (such as SQLite or Memcached); or can be custom handler as defined by session_set_save_handler. The read callback will retrieve any existing session data (stored in a special serialized format) and will be unserialized and used to automatically populate the $_SESSION superglobal when the read callback returns the saved session data back to PHP session handling. 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_gzhandler must be registered before starting the session. Parameters
Return Values
This function returns Changelog
ExamplesA basic session example
Example #1 page1.php
<?php
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
Example #2 page2.php
<?php Providing options to session_startExample #3 Overriding the cookie lifetime
<?php Example #4 Reading the session and closing it
<?php Notes
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