Standard file I/Ofopen, unlink, flock, file, opendir, readdir

Standard file I/Ofopen, unlink, flock, file, opendir, readdir fopen (public file)

$ Fno = fopen ("path/filename", 'r '); | _ r read-only | r + input/output | w write-only | w + input/output (overwrite) | a append output | a + input/output (append output) | _ file name | _ file processing Flase = error}

Fclose (close file)

Fclose ($ fno); | _ file processing

If you want to disable unopened file processing, an error will occur.

Unlink (delete)

$ Rcd = unlink ("path/filename"); | _ file name | _ True = normal False = error

File_exists (check whether the file exists)

$ Rcd = file_exists ("path/filename"); | _ file name | _ True = existence False = nonexistent

Filesize (file size)

$ Size = filesize ("path/filename"); | _ file name | _ bytes

Filemtime (File time Mark)

$ Time = filemtime ("path/filename"); | _ file name | _ UNIX time Mark $ dttm = date ('Y. m. d H: I: S', filemtime ("path/filename"); | _ format | _ '2002. 06.01 15:00:00'

Copy)

$ Rcd = copy ("path/filename", "path2/filename2"); | _ target file name | _ source file name | _ True = normal False = error

Rename (change file name)

$ Rcd = rename ("path/filename", "path2/filename2"); | _ new file name | _ old file name | _ True = normal False = error

Flock (file lock, exclusive control)

Flock ($ fno, 2); | _ 1 lock read shares (in PHP4, with LOCK_SH constant) | 2 lock write exclusively (in PHP4, with LOCK_EX constant) | 3 unlock (in PHP4, there are LOCK_UN constants) | _ file processing set_file_buffer ($ fno, 0); | _ specify 0 to prevent misoperation when locking the file and fwrite buffer.

Text stream I/O example

$ Rcd = rename ("path/filename", "path2/filename2"); | _ new file name | _ old file name | _ True = normal False = error

Flock (file lock, exclusive control)

[Example 1] input

if (!($fno = fopen("test.txt", 'r'))) {    die;}  while (!feof($fno)) {    $rec = fgets($fno, 32000);}  fclose($fno);

[Example 2] input

$rec = file("test.txt");  reset($rec);  while ($a = each($rec)) {  print "$a[0] - $a[1]\n";}

(Example 3) enter foreach to use only PHP4)

$rec = file("test.txt");  foreach ($rec as $a) {  print "$a\n";  }

[Example 4] input

if (!($fno = fopen("test.txt", 'w'))) {    die;}  fwrite($fno, "aaaaa\n", 32000);  fwrite($fno, "bbbbb\n", 32000);  fclose($fno);

Opendir (Open Directory)

$ Dir = opendir ("path"); | _ directory | _ file processing Flase = error

Closedir (close directory)

Closedir ($ dir); | _ file processing

Directory reference example

[Example]

if (!($dir = opendir("./"))) {    die;}  while ($fnm = readdir($dir)) {    print "$fnm\n";}  closedir($dir);

** Note that "." and "." are also included.

[Example] extract only the specified extension

if (!($dir = opendir("./"))) {    die;}  while ($fnm = readdir($dir)) {    if (ereg('.php$', $fnm)) {    print "$fnm\n";}}  closedir($dir);

[Example] ascending order

if (!($dir = opendir("./"))) {    die;}  while ($fnm[] = readdir($dir));  closedir($dir);  sort($fnm);  reset($fnm);  while ($a = each($fnm)) {  print "$a[1]\n"; }

** Note that "." and "." are also included.

[Example] descending order

if (!($dir = opendir("./"))) {    die;}  while ($fnm[] = readdir($dir));  closedir($dir);  rsort($fnm);  reset($fnm);  while ($a = each($fnm)) {  print "$a[1]\n";}