posix_access(3) [php man page]

POSIX_ACCESS(3) 							 1							   POSIX_ACCESS(3)

posix_access - Determine accessibility of a file

SYNOPSIS

       bool posix_access (string  $file, [int  $mode = POSIX_F_OK])

DESCRIPTION

       posix_access(3) checks the user's permission of a file.

PARAMETERS

	      o $file
		- The name of the file to be tested.

	      o $mode
		-  A  mask  consisting of one or more of POSIX_F_OK, POSIX_R_OK, POSIX_W_OK and POSIX_X_OK.  POSIX_R_OK, POSIX_W_OK and POSIX_X_OK
		request checking whether the file exists and has read, write and execute  permissions,	respectively.	POSIX_F_OK  just  requests
		checking for the existence of the file.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      posix_access(3) example

	       This example will check if the $file is readable and writable, otherwise will print an error message.

	      <?php

	      $file = 'some_file';

	      if (posix_access($file, POSIX_R_OK | POSIX_W_OK)) {
		  echo 'The file is readable and writable!';

	      } else {
		  $error = posix_get_last_error();

		  echo "Error $error: " . posix_strerror($error);
	      }

	      ?>

NOTES

       Note

	      When  safe  mode is enabled, PHP checks whether the files or directories being operated upon have the same UID (owner) as the script
	      that is being executed.

SEE ALSO

       posix_get_last_error(3), posix_strerror(3).

PHP Documentation Group 													   POSIX_ACCESS(3)

Check Out this Related Man Page

IS_WRITABLE(3)								 1							    IS_WRITABLE(3)

is_writable - Tells whether the filename is writable

SYNOPSIS

       bool is_writable (string  $filename)

DESCRIPTION

	Returns  TRUE  if the $filename exists and is writable. The filename argument may be a directory name allowing you to check if a directory
       is writable.

	Keep in mind that PHP may be accessing the file as the user id that the web server runs as (often 'nobody'). Safe mode limitations are not
       taken into account.

PARAMETERS

	      o $filename
		- The filename being checked.

RETURN VALUES

	Returns TRUE if the $filename exists and is writable.

EXAMPLES

       Example #1

	      is_writable(3) example

	      <?php
	      $filename = 'test.txt';
	      if (is_writable($filename)) {
		  echo 'The file is writable';
	      } else {
		  echo 'The file is not writable';
	      }
	      ?>

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), file_exists(3), fwrite(3).

PHP Documentation Group 													    IS_WRITABLE(3)

Linux and UNIX Man Pages

posix_access(3) [php man page]

Check Out this Related Man Page