php 相关系统函数
get_current_user () 获取当前PHP脚本的所有者的名称
substr(sprintf("%o",fileperms(getcwd())),-4) 获取当前文件/目录权限
scandir（getcwd()） 获取当前目录所有文件/目录
print_r(posix_getpwuid(10000)); 获取某uid用户信息
chmod("test.txt",0777); 修改指定文件 或目录权限
fileowner() 函数返回文件的所有者。
php_uname() 获取系统类型及版本
getmyuid() 获取PHP脚本页面所有者的UID号码
print_r (ini_get_all()); 获取所有配置选项
print_r (php_ini_scanned_files()); 返回配置文件目录下的配置文件列表
$uid = @posix_getpwuid(@posix_geteuid()); 获取当前用UID 信息
$gid = @posix_getgrgid(@posix_getegid()); 获取当前组GID 信息
$user = $uid['name']; 提取用户信息数组中 name
$uid = $uid['uid']; 提取当前用户信息数组中 uid
$group = $gid['name']; 提取当前组信息数组中 name
$gid = $gid['gid']; 提取当前组信息中 gid
摘自：lostwolf's Blog
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