PHP: Sets user-level session storage functions

Description

bool session_set_save_handler ( callback $open , callback $close , callback $read , callback $write , callback $destroy , callback $gc )

session_set_save_handler() sets the user-level session storage functions which are used for storing and retrieving data associated with a session. This is most useful when a storage method other than those supplied by PHP sessions is preferred. i.e. Storing the session data in a local database.

Parameters

open

close

read

Read function must return string value always to make save handler work as expected. Return empty string if there is no data to read. Return values from other handlers are converted to boolean expression. TRUE for success, FALSE for failure.

write

Note: The "write" handler is not executed until after the output stream is closed. Thus, output from debugging statements in the "write" handler will never be seen in the browser. If debugging output is necessary, it is suggested that the debug output be written to a file instead.

destroy

gc

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example #1 session_set_save_handler() example

The following example provides file based session storage similar to the PHP sessions default save handler files . This example could easily be extended to cover database storage using your favorite PHP supported database engine.


<?php

function open($save_path, $session_name)

{

  global $sess_save_path;



  $sess_save_path = $save_path;

  return(true);

}



function close()

{

  return(true);

}



function read($id)

{

  global $sess_save_path;



  $sess_file = "$sess_save_path/sess_$id";

  return (string) @file_get_contents($sess_file);

}



function write($id, $sess_data)

{

  global $sess_save_path;



  $sess_file = "$sess_save_path/sess_$id";

  if ($fp = @fopen($sess_file, "w")) {

    $return = fwrite($fp, $sess_data);

    fclose($fp);

    return $return;

  } else {

    return(false);

  }



}



function destroy($id)

{

  global $sess_save_path;



  $sess_file = "$sess_save_path/sess_$id";

  return(@unlink($sess_file));

}



function gc($maxlifetime)

{

  global $sess_save_path;



  foreach (glob("$sess_save_path/sess_*") as $filename) {

    if (filemtime($filename) + $maxlifetime < time()) {

      @unlink($filename);

    }

  }

  return true;

}



session_set_save_handler("open", "close", "read", "write", "destroy", "gc");



session_start();



// proceed to use sessions normally



?>

Notes

Warning

As of PHP 5.0.5 the write and close handlers are called after object destruction and therefore cannot use objects or throw exceptions. The object destructors can however use sessions.

It is possible to call session_write_close() from the destructor to solve this chicken and egg problem.

Warning

Current working directory is changed with some SAPIs if session is closed in the script termination. It is possible to close the session earlier with session_write_close().

session_set_save_handler

Description

Parameters

Return Values

Examples

Notes

See Also