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Directory

is_dir($s) returns true if $s is a directory. getcwd() returns the current working directory as a string. chdir($s) changes the current directory to $s and returns true on success. scandir($s[,$i= SCANDIR_SORT_ASCENDING]) returns an array of files and directories from the directory $s, or false on failure. $i can be SCANDIR_SORT_ASCENDING, SCANDIR_SORT_DESCEDING, or SCANDIR_SORT_ NONE. mkdir($s[,$i=0777[,$b=false]]) creates the directory $s with an access code (see chmod()) of $i, and returns true on success. If $b is set to true, then nested directories can be created.  rename($s1,$s2) renames a file or directory $s1 to $s2, moving it between directories if necessary, and returns true on success. If $s2 exists, it will be overwritten. rmdir($s) removes an empty directory $s, and returns true on success. 

<!DOCTYPE html><html><head></head>
<body><?php

mkdir("testing");
rename ("testing","testing2");
var_dump(is_dir("testing2"));echo "<br />";
print_r(scandir("./testing2/.."));  // back to the current dir
chdir("testing2");
echo getcwd();
rename("../a.html","b.html");
rmdir("../testing2");

?></body></html>

bool(true)
Array ( [0] => . [1] => .. [2] => a.html [3] => action.php [4] => alpha_beta.php [5] => apache_pb.gif [6] => apache_pb.png [7] => apache_pb2.gif [8] => apache_pb2.png [9] => apache_pb2_ani.gif [10] => bar.php [11] => error.txt [12] => favicon.ico [13] => foo.php [14] => forbidden [15] => index.html [16] => intro.php [17] => restricted [18] => submit.gif [19] => test.php [20] => testing2 [21] => upload [22] => upload.php [23] => upload_file.php [24] => xampp ) E:\Program Files\xampp\htdocs\testing2
Warning: rmdir(../testing2): Directory not empty in E:\Program Files\xampp\htdocs\intro.php on line 11
opendir($s) opens a directory handle and returns the resource. False is returned on failure. dir($s) returns an instance of the Directory class for the directory $s.

Synopsis for the class Directory:
Properties
string $path
resource $handle
Methods
void close([resource $dir_handle])
ALIAS closedir(……)
This closes the directory handle.
string read([resource $dir_handle])
ALIAS readdir(……)
This returns the next entry. False is returned on failure.
void rewind([resource $dir_handle])
ALIAS rewinddir(……)
This rewinds the stream to the beginning.

RESETRUNFULL
<!DOCTYPE html><html><head></head>
<body><?php

$r=opendir(".");
while (false !== ($entry = readdir($r))) 
     echo "$entry"."<br />";
closedir($r);

$d=dir(".");
echo $d->path."<br />";
echo $d->read()."<br />";
echo $d->read()."<br />";
echo $d->read()."<br />";
$d->rewind();
echo $d->read()."<br />";
$d->close();

?></body></html>
basename($s1[,$s2]) returns the trailing name component of the path $s1. Any suffix $s2 will be cut off. dirname($s) returns the parent directory of the path $s. pathinfo($s[,$i= PATHINFO_ DIRNAME|PATHINFO_BASENAME|PATHINFO_ EXTENSION|PATHINFO_FILENAME]) returns information about a file path $s, as an array or string. realpath($s) returns the absolute pathname of $s. realpath_cache_get() returns an array of realpath cache entries. realpath_cache_size() returns the amount of memory used by the realpath cache. disk_free_space($s) or diskfreespace($s) returns the available space of a filesystem as specified by the path $s. disk_total_space($s) returns the total size of a filesystem as specified by the path $s. 

<!DOCTYPE html><html><head></head>
<body><?php

echo basename("/abc/def/ghi","i")."<br />";
echo dirname("xampp/external")."<br />";
print_r(pathinfo("xampp/external/cds.php"));echo "<br />";
echo realpath(".")."<br />";
echo realpath_cache_sizE()."<br />";
echo disk_free_space(".")."<br />";
echo disk_total_space(".")."<br />";

?></body></html>

gh
xampp
Array ( [dirname] => xampp/external [basename] => cds.php [extension] => php [filename] => cds ) 
E:\Program Files\xampp\htdocs
748
1088978944
58558771200