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(PHP 4, PHP 5)

session_registerRegister one or more global variables with the current session


bool session_register ( mixed $name [, mixed $... ] )

session_register() accepts a variable number of arguments, any of which can be either a string holding the name of a variable or an array consisting of variable names or other arrays. For each name, session_register() registers the global variable with that name in the current session.

You can also create a session variable by simply setting the appropriate member of the $_SESSION or $HTTP_SESSION_VARS (PHP < 4.1.0) array. <?php
// Use of session_register() is deprecated
$barney "A big purple dinosaur.";

// Use of $_SESSION is preferred, as of PHP 4.1.0
$_SESSION["zim"] = "An invader from another planet.";

// The old way was to use $HTTP_SESSION_VARS
$HTTP_SESSION_VARS["spongebob"] = "He's got square pants.";

If session_start() was not called before this function is called, an implicit call to session_start() with no parameters will be made. $_SESSION does not mimic this behavior and requires session_start() before use.


自 PHP 5.3.0 起,已经废弃此函数。强烈建议不要应用此函数 。



A string holding the name of a variable or an array consisting of variable names or other arrays.



成功时返回 TRUE, 或者在失败时返回 FALSE.



If you want your script to work regardless of register_globals, you need to instead use the $_SESSION array as $_SESSION entries are automatically registered. If your script uses session_register(), it will not work in environments where the PHP directive register_globals is disabled.

Note: register_globals 重要说明:

自 PHP 4.2.0 起,PHP 指令 register_globals 的默认值为 off。 PHP 社区鼓励开发者不要依赖于此指令, 用其他手段替代,例如 superglobals


This registers a global variable. If you want to register a session variable from within a function, you need to make sure to make it global using the global keyword or the $GLOBALS[] array, or use the special session arrays as noted below.


If you are using $_SESSION (or $HTTP_SESSION_VARS), do not use session_register(), session_is_registered(), and session_unregister().


It is currently impossible to register resource variables in a session. For example, you cannot create a connection to a database and store the connection id as a session variable and expect the connection to still be valid the next time the session is restored. PHP functions that return a resource are identified by having a return type of resource in their function definition. A list of functions that return resources are available in the resource types appendix.

If $_SESSION (or $HTTP_SESSION_VARS for PHP 4.0.6 or less) is used, assign values to $_SESSION. For example: $_SESSION['var'] = 'ABC';


  • session_cache_expire
  • session_cache_limiter
  • session_commit
  • session_decode
  • session_destroy
  • session_encode
  • session_get_cookie_params
  • session_id
  • session_is_registered
  • session_module_name
  • session_name
  • session_regenerate_id
  • session_register
  • session_save_path
  • session_set_cookie_params
  • session_set_save_handler
  • session_start
  • session_status
  • session_unregister
  • session_unset
  • session_write_close
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