预定义常量：
DIRECTORY_SEPARATOR (string) ：目录分隔符
PATH_SEPARATOR (string) ：路径分隔符
bool chdir ( string $directory )— 改变目录
echo getcwd() . "\n";
chdir('public_html');
echo getcwd() . "\n";
bool chroot ( string $directory )— 改变根目录，仅在系统支持且运行于 CLI，CGI 或嵌入 SAPI 版本时才行。
dir::dir ( string $directory )— directory 类，有三个方法可用：read，rewind（将文件内部的位置指针重新指向一个数据流开头） 和 close
$d = dir("E:/work/html");
foreach($d as $k=>$v){
echo $k.'->' .$v. '
';
}
while(false !== ($entry = $d->read())){
echo $entry."
";
}
$d->close();
void closedir ( resource $dir_handle )— 关闭目录句柄
$dir = "/etc/php5/";
if (is_dir($dir)) {
if ($dh = opendir($dir)){
$directory = readdir($dh);
closedir($dh);
}
}
string getcwd ( void )— 取得当前工作目录
resource opendir ( string $path [, resource $context ] )— 打开目录句柄
string readdir ( resource $dir_handle )— 从目录句柄中读取条目
if ($handle = opendir('/path/to/files')) {
echo "Directory handle: $handle\n";
echo "Files:\n";
while (false !== ($file = readdir($handle))) {
echo "$file\n";
}
closedir($handle);
}
void rewinddir ( resource $dir_handle ) —将 dir_handle 指定的目录流重置到目录的开头
array scandir ( string $directory [, int $sorting_order [, resource $context ]] )— 列出指定路径中的文件和目录
$dir = '/tmp';
$files1 = scandir($dir);
$files2 = scandir($dir, 1);
print_r($files1);
print_r($files2);
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