zhe.inkphpinfo()调试也好，在后台查看也好，应该适当隐藏私密信息。
一般只需要查看1，4，8，那么
echo phpinfo(13); // 即可显示模块，配置，基础信息
| Name (constant) | Value | Description |
|---|---|---|
| INFO_GENERAL | 1 | The configuration line, php.ini location, build date, Web Server, System and more. |
| INFO_CREDITS | 2 | PHP Credits. See also phpcredits(). |
| INFO_CONFIGURATION | 4 | Current Local and Master values for PHP directives. See also ini_get(). |
| INFO_MODULES | 8 | Loaded modules and their respective settings. See also get_loaded_extensions(). |
| INFO_ENVIRONMENT | 16 | Environment Variable information that's also available in $_ENV. |
| INFO_VARIABLES | 32 | Shows all predefined variables from EGPCS (Environment, GET, POST, Cookie, Server). |
| INFO_LICENSE | 64 | PHP License information. See also the » license FAQ. |
| INFO_ALL | -1 | Shows all of the above. |
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