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今天我们在调△试服务器的时□□候出现了一个□□□错误，下面是错误的□□□内容

Warning: session_start(): open(C:/Program Files/php/sessiontempsess_0cde28de3ce1a2e2cc8e8723b5a40279, O_RDWR) failed: Permission denied (13) in D:home400mzmxxxwebsyssiteinstalldatainstall.php on line 7

Warning: Unknown(): open(C:/Program Files/php/sessiontempsess_0cde28de3ce1a2e2cc8e8723b5a40279, O_RDWR) failed: Permission denied (13) in Unknown on line 0

Warning: Unknown(): Failed to write session data (files). Please verify that the current setting of session.save_path is correct (C:/Program Files/php/sessiontemp) in Unknown on line 0

通过以上的错□□误我们可以看▲到是因为没有△了临时目录造□□□□成的，

解决办法：
修改php.ini中的session.auto_start = 0 为 session.auto_start = 1
重启IIS调试!

如果还提示以□□□□下类似的警告:

Warning: session_start() [function.session-start]: open(/tmpsess_84cb589ea249708b09c3d5e6836fdd0d, O_RDWR) failed: No such file or directory (2) in E:webhtdocs111.php on line 9

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at E:webhtdocs111.php:8) in E:webhtdocs111.php on line 9

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at E:webhtdocs111.php:8) in E:webhtdocs111.php on line 9

Warning: Unknown(): open(/tmpsess_84cb589ea249708b09c3d5e6836fdd0d, O_RDWR) failed: No such file or directory (2) in Unknown on line 0

Warning: Unknown(): Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0 就是 session变量需要系统□□的临时空间
session.save_path = "设置一个有效□□文件夹的绝对□□□□路径"
(比如 session.save_path = "C:WINDOWStemp" )
session.save_path =前面的 “;”分号去掉

另外编辑该文□□□件夹的权限 添加EVERYONE 有写入修改权□□□□限即可!