mysqlnd_qc_set_storage_handler(3) [php man page]

MYSQLND_QC_SET_STORAGE_HANDLER(3)					 1					 MYSQLND_QC_SET_STORAGE_HANDLER(3)

mysqlnd_qc_set_storage_handler - Change current storage handler

SYNOPSIS

       bool mysqlnd_qc_set_storage_handler (string  $handler)

DESCRIPTION

	Sets  the  storage handler used by the query cache. A list of available storage handler can be obtained from mysqlnd_qc_get_available_han-
       dlers(3). Which storage are available depends on the compile time configuration of the query cache plugin. The default storage  handler	is
       always available. All other storage handler must be enabled explicitly when building the extension.

PARAMETERS

	      o $handler
		-  Handler  can  be  of  type  string  representing  the  name	of a built-in storage handler or an object of type mysqlnd_qc_han-
		dler_default. The names of the built-in storage handler are default, APC, MEMCACHE, sqlite.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

	If changing the storage handler fails a catchable fatal error will be thrown. The query cache cannot operate if the previous storage  han-
       dler has been shutdown but no new storage handler has been installed.

EXAMPLES

       Example #1

	      mysqlnd_qc_set_storage_handler(3) example

	       The example shows the output from the built-in default storage handler. Other storage handler may report different data.

	      <?php
	      var_dump(mysqlnd_qc_set_storage_handler("memcache"));

	      if (true === mysqlnd_qc_set_storage_handler("default"))
		printf("Default storage handler activated");

	      /* Catchable fatal error */
	      var_dump(mysqlnd_qc_set_storage_handler("unknown"));
	      ?>

	      The above examples will output:

	      bool(true)
	      Default storage handler activated
	      Catchable fatal error: mysqlnd_qc_set_storage_handler(): Unknown handler 'unknown' in (file) on line (line)

SEE ALSO

       Installation, mysqlnd_qc_get_available_handlers(3).

PHP Documentation Group 											 MYSQLND_QC_SET_STORAGE_HANDLER(3)

SESSIONHANDLERINTERFACE(3)						 1						SESSIONHANDLERINTERFACE(3)

The SessionHandlerInterface class

INTRODUCTION

       SessionHandlerInterface	is an interface which defines a prototype for creating a custom session handler. In order to pass a custom session
       handler to session_set_save_handler(3) using its OOP invocation, the class must implement this interface.

	Please note the callback methods of this class are designed to be called internally by PHP and are not meant to be called from	user-space
       code.

CLASS SYNOPSIS

       SessionHandlerInterface

       SessionHandlerInterface

       Methods

       o abstractpublic bool SessionHandlerInterface::close (void  )

       o abstractpublic bool SessionHandlerInterface::destroy (string  $session_id)

       o abstractpublic bool SessionHandlerInterface::gc (string  $maxlifetime)

       o abstractpublic bool SessionHandlerInterface::open (string  $save_path, string	$name)

       o abstractpublic string SessionHandlerInterface::read (string  $session_id)

       o abstractpublic bool SessionHandlerInterface::write (string  $session_id, string  $session_data)

       Example #1

	       Example using SessionHandlerInterface

	       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.

	       Note we use the OOP prototype with session_set_save_handler(3) and register the shutdown function using	the  function's  parameter
	      flag. This is generally advised when registering objects as session save handlers.

	      <?php
	      class MySessionHandler implements SessionHandlerInterface
	      {
		  private $savePath;

		  public function open($savePath, $sessionName)
		  {
		      $this->savePath = $savePath;
		      if (!is_dir($this->savePath)) {
			  mkdir($this->savePath, 0777);
		      }

		      return true;
		  }

		  public function close()
		  {
		      return true;
		  }

		  public function read($id)
		  {
		      return (string)@file_get_contents("$this->savePath/sess_$id");
		  }

		  public function write($id, $data)
		  {
		      return file_put_contents("$this->savePath/sess_$id", $data) === false ? false : true;
		  }

		  public function destroy($id)
		  {
		      $file = "$this->savePath/sess_$id";
		      if (file_exists($file)) {
			  unlink($file);
		      }

		      return true;
		  }

		  public function gc($maxlifetime)
		  {
		      foreach (glob("$this->savePath/sess_*") as $file) {
			  if (filemtime($file) + $maxlifetime < time() && file_exists($file)) {
			      unlink($file);
			  }
		      }

		      return true;
		  }
	      }

	      $handler = new MySessionHandler();
	      session_set_save_handler($handler, true);
	      session_start();

	      // proceed to set and retrieve values by key from $_SESSION

PHP Documentation Group 												SESSIONHANDLERINTERFACE(3)