php文件总结

// current directoryecho getcwd() . "\n";chdir('hhh');// current directoryecho getcwd() . "\n";

D:\xampp\htdocs\my\function
D:\xampp\htdocs\my\function\hhh

$dir = 'D:\xampp\htdocs\my\function';// Open a known directory, read directory into variable and then closeif (is_dir($dir)) {    if ($dh = opendir($dir)) {        $ds = array();        while ($directory = readdir($dh)) {            $ds[] = $directory;        }        rewinddir($dh);        while ($directory = readdir($dh)) {            $ds[] = $directory;        }        closedir($dh);    }}print_r($ds);

Array ( [0] => . [1] => .. [2] => file.php [3] => hhh [4] => . [5] => .. [6] => file.php [7] => hhh )

$dir = 'D:\xampp\htdocs\my\function';showfiles3($dir);function showfiles1($dir){    if (is_dir($dir))    {        echo "
";        $dh = opendir($dir);        while ($file = readdir($dh))        {            if (is_dir($dir.DIRECTORY_SEPARATOR.$file))            {                if ($file !='.' && $file != '..') {                    echo "
";                    echo "|-".$file;                    showfiles1($dir.DIRECTORY_SEPARATOR.$file);                    echo "
";                }            } else{                echo "
";                echo "--".$file;                echo "
";            }        }        closedir($dh);        echo "
";    }}function showfiles2($dir){    echo "
";    $arr = scandir($dir);    foreach ($arr as $file)    {        if (is_dir($dir.DIRECTORY_SEPARATOR.$file))        {            if ($file !='.' && $file != '..') {                echo "
";                echo "|-".$file;                showfiles2($dir.DIRECTORY_SEPARATOR.$file);                echo "
";            }        } else{            echo "
";            echo "--".$file;            echo "
";        }    }    echo "
";}function showfiles3($dir) {      foreach (glob($dir.DIRECTORY_SEPARATOR.'*') as $f)    {        echo is_dir($f) ? showfiles3($f) : "$f
";               }}

$dir = 'D:\xampp\htdocs\my\function';$d = scandir($dir, 1);print_r($d);

Array ( [0] => hhh [1] => file.php [2] => .. [3] => . )

//目录的检索函数glob()//检索当前目录下所有"*.txt"的文件$files = glob("*.txt");//检索当前目录下所有以"t"开头的子目录$files = glob("t*",GLOB_ONLYDIR);//检索当前目录下所有以"d,t或p"开头的php文件$files = glob("{d,t,p}*.php",GLOB_BRACE);

一点小疑问：.文件 和 ..文件的详细分析