file_exists(3) [php man page]

FILE_EXISTS(3)								 1							    FILE_EXISTS(3)

file_exists - Checks whether a file or directory exists

SYNOPSIS

       bool file_exists (string  $filename)

DESCRIPTION

	Checks whether a file or directory exists.

PARAMETERS

	      o $filename
		- Path to the file or directory.  On windows, use //computername/share/filename or \computernamesharefilename to check files on
		network shares.

RETURN VALUES

	Returns TRUE if the file or directory specified by $filename exists; FALSE otherwise.

       Note

	       This function will return FALSE for symlinks pointing to non-existing files.

       Warning

	       This function returns FALSE for files inaccessible due to safe mode restrictions. However these files still can be included if they
	      are located in safe_mode_include_dir.

       Note

	       The check is done using the real UID/GID instead of the effective one.

       Note

	       Because PHP's integer type is signed and many platforms use 32bit integers, some filesystem functions may return unexpected results
	      for files which are larger than 2GB.

EXAMPLES

       Example #1

	      Testing whether a file exists

	      <?php
	      $filename = '/path/to/foo.txt';

	      if (file_exists($filename)) {
		  echo "The file $filename exists";
	      } else {
		  echo "The file $filename does not exist";
	      }
	      ?>

ERRORS
/EXCEPTIONS
	Upon failure, an E_WARNING is emitted.

NOTES

       Note

	      The results of this function are cached. See clearstatcache(3) for more details.

       Tip

	      As of PHP 5.0.0, this function can also be used with some URL wrappers. Refer to "Supported Protocols  and  Wrappers"  to  determine
	      which wrappers support stat(3) family of functionality.

SEE ALSO

       is_readable(3), is_writable(3), is_file(3), file(3).

PHP Documentation Group 													    FILE_EXISTS(3)

FILEPERMS(3)								 1							      FILEPERMS(3)

fileperms - Gets file permissions

SYNOPSIS

       int fileperms (string  $filename)

DESCRIPTION

	Gets permissions for the given file.

PARAMETERS

	      o $filename
		- Path to the file.

RETURN VALUES

	Returns the file's permissions as a numeric mode. Lower bits of this mode are the same as the permissions expected by chmod(3), however on
       most platforms the return value will also include information on the type of file given as $filename. The examples below demonstrate how to
       test the return value for specific permissions and file types on POSIX systems, including Linux and Mac OS X.

	For  local  files,  the specific return value is that of the st_mode member of the structure returned by the C library's stat(3) function.
       Exactly which bits are set can vary from platform to platform, and looking up your specific  platform's	documentation  is  recommended	if
       parsing the non-permission bits of the return value is required.

EXAMPLES

       Example #1

	      Display permissions as an octal value

	      <?php
	      echo substr(sprintf('%o', fileperms('/tmp')), -4);
	      echo substr(sprintf('%o', fileperms('/etc/passwd')), -4);
	      ?>

	      The above example will output:

	      1777
	      0644

       Example #2

	      Display full permissions

	      <?php
	      $perms = fileperms('/etc/passwd');

	      if (($perms & 0xC000) == 0xC000) {
		  // Socket
		  $info = 's';
	      } elseif (($perms & 0xA000) == 0xA000) {
		  // Symbolic Link
		  $info = 'l';
	      } elseif (($perms & 0x8000) == 0x8000) {
		  // Regular
		  $info = '-';
	      } elseif (($perms & 0x6000) == 0x6000) {
		  // Block special
		  $info = 'b';
	      } elseif (($perms & 0x4000) == 0x4000) {
		  // Directory
		  $info = 'd';
	      } elseif (($perms & 0x2000) == 0x2000) {
		  // Character special
		  $info = 'c';
	      } elseif (($perms & 0x1000) == 0x1000) {
		  // FIFO pipe
		  $info = 'p';
	      } else {
		  // Unknown
		  $info = 'u';
	      }

	      // Owner
	      $info .= (($perms & 0x0100) ? 'r' : '-');
	      $info .= (($perms & 0x0080) ? 'w' : '-');
	      $info .= (($perms & 0x0040) ?
			  (($perms & 0x0800) ? 's' : 'x' ) :
			  (($perms & 0x0800) ? 'S' : '-'));

	      // Group
	      $info .= (($perms & 0x0020) ? 'r' : '-');
	      $info .= (($perms & 0x0010) ? 'w' : '-');
	      $info .= (($perms & 0x0008) ?
			  (($perms & 0x0400) ? 's' : 'x' ) :
			  (($perms & 0x0400) ? 'S' : '-'));

	      // World
	      $info .= (($perms & 0x0004) ? 'r' : '-');
	      $info .= (($perms & 0x0002) ? 'w' : '-');
	      $info .= (($perms & 0x0001) ?
			  (($perms & 0x0200) ? 't' : 'x' ) :
			  (($perms & 0x0200) ? 'T' : '-'));

	      echo $info;
	      ?>

	      The above example will output:

	      -rw-r--r--

ERRORS
/EXCEPTIONS
	Upon failure, an E_WARNING is emitted.

NOTES

       Note

	      The results of this function are cached. See clearstatcache(3) for more details.

       Tip

	      As  of  PHP  5.0.0,  this function can also be used with some URL wrappers. Refer to "Supported Protocols and Wrappers" to determine
	      which wrappers support stat(3) family of functionality.

SEE ALSO

       chmod(3), is_readable(3), stat(3).

PHP Documentation Group 													      FILEPERMS(3)