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PHP会话处理相关函数介绍

在PHP开发中,比起Cookie,Session 是存储在服务器端的会话,相对安全,并且不像 Cookie 那样有存储长度限制,这里我们详细介绍一下PHP处理会话函数将要用到10个函数。

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PHP处理会话函数1、 session_start

函数功能:开始一个会话或者返回已经存在的会话。
函数原型:boolean session_start(void);
返回值:布尔值
功能说明:这个函数没有参数,且返回值均为true。最好将这个函数置于最先,而且在它之前不能有任何输出,否则会报警,如:Warning: Cannot send session cache limiter – headers already sent (output started at /usr/local/apache/htdocs/cga/member/1.php:2) in /usr/local/apache/htdocs/cga/member/1.php on line 3
PHP处理会话函数2、 session_register

函数功能:登记一个新的变量为会话变量
函数原型:boolean session_register(string name);
返回值:布尔值。
功能说明:这个函数是在全局变量中增加一个变量到当前的SESSION中,参数name就是想要加入的变量名,成功则返回逻辑值true。可以用$_SESSION[name]或$HTTP_SESSION_VARS[name]的形式来取值或赋值。
PHP处理会话函数3、 session_is_registered

函数功能:检查变量是否被登记为会话变量。
函数原型:boobean session_is_registered(string name);
返回值:布尔值
功能说明:这个函数可检查当前的session之中是否已有指定的变量注册,参数name就是要检查的变量名。成功则返回逻辑值true。
PHP处理会话函数4、 session_unregister

函数功能:删除已注册的变量。
函数原型:boolean session_session_unregister(string name);
返回值:布尔值
功能说明:这个函数在当前的session之中删除全局变量中的变量。参数name就是欲删除的变量名,成功则返回true。
PHP处理会话函数5、 session_destroy

函数功能:结束当前的会话,并清空会话中的所有资源。
函数原型:boolean session destroy(void);
返回值:布尔值。
功能说明:这个函数结束当前的session,此函数没有参数,且返回值均为true。
PHP处理会话函数6、 session_encode

函数功能:sesssion信息编码
函数原型:string session_encode(void);
返回值:字符串
功能说明:返回的字符串中包含全局变量中各变量的名称与值,形式如:a|s:12:”it is a test”;c|s:4:”lala”; a是变量名 s:12代表变量a的值”it is a test的长度是12 变量间用分号”;”分隔。
PHP处理会话函数7、 session_decode

函数功能:sesssion信息解码
函数原型:boolean session_decode (string data)
返回值:布尔值
功能说明:这个函数可将session信息解码,成功则返回逻辑值true。
PHP处理会话函数8、 session_name

函数功能:存取当前会话名称
函数原型:boolean session_name(string [name]);
返回值:字符串
功能说明:这个函数可取得或重新设置当前session的名称。若无参数name则表示获取当前session名称,加上参数则表示将session名称设为参数name。
PHP处理会话函数9、 session_id

函数功能:存取当前会话标识号
函数原型:boolean session_id(string [id]);
返回值:字符串
功能说明:这个函数可取得或重新设置当前存放session的标识号。若无参数id则表示只获取当前session的标识号,加上参数则表示将session的标识号设成新指定的id。
PHP处理会话函数10、 session_unset

函数功能:删除所有已注册的变量。
函数原型:void session_unset (void)
返回值:布尔值
功能说明:这个函数和Session_destroy不同,它不结束会话。就如同用函数session_unregister逐一注销掉所有的会话变量。

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