FileSystem Function in PHP: Part 18

Introduction

In this article I describe the PHP FileSystem functions tempnam, tempfile, touch, unmask and unlink. To learn some other FileSystem functions, go to:

1. FileSystem Function in PHP: PART 1
2. FileSystem Function in PHP: PART 2
3. FileSystem Function in PHP: PART 3
4. FileSystem Function in PHP: PART 4
5. FileSystem Function in PHP: PART 5
6. FileSystem Function in PHP: PART 6
7. FileSystem Function in PHP: PART 7
8. FileSystem Function in PHP: PART 8
9. FileSystem Function in PHP: PART 9
10. FileSystem Function in PHP: PART 10
11. FileSystem Function in PHP: PART 11
12. FileSystem Function in PHP: PART 12
13. FileSystem Function in PHP: PART 13
14. FileSystem Function in PHP: PART 14
15. FileSystem Function in PHP: PART 15
16. FileSystem Function in PHP: PART 16
17. FileSystem Function in PHP: PART 17

PHP tempnam() function

The PHP FileSystem tempnam function is used to create file with unique file name and returns the new temporary file on success or false on failure.

Syntax
 

tempnam(dir,prefix)

Parameters in the tempnam function

The parameters of the function are:
 

Parameter	Description
dir	It specifies the directory of where to create the temp file.
prefix	It specifies the start of the file name.

Example

An example of the function is:

<?php

echo tempnam("C:\www\wamp","TempFile");

?>
Output



PHP tempfile() function

The PHP FileSystem tempfile function creates a temporary file and it returns a file handle or false on failure.

Syntax 

tmpfile()

Example

An example of the function is:

<?php

$temp = tmpfile();

fwrite($temp, "Testing.............");

fseek($temp, 0);

echo fread($temp, 1024);

fclose($temp);

?>
Output


PHP touch() function

The PHP FileSystem touch function sets the access and modification time of a file and it returns true on success and false on failure.

Syntax

touch(filename,time,atime)

Parameter in touch  function

The parameters of the function are:
 

Parameter	Description
filename	It specifies the file to touch
time	It is used to set the time.
atime	It sets the access time.

Example

An example of the function is:
 

<?php

if (!touch('text.txt')) {

    echo 'Whoops, something went wrong...';

} else {

    echo 'Touched file with success';

}

?>
Output


PHP unmask() function

The PHP FileSystem unmask function is used to change the current unmask; it simply returns the current unmask on success otherwise the old unmask is returned.

Syntax  

unmask(mask)

Parameter in unmask  function

The parameters of the function is:
 

Parameter	Description
mask	It specifies the new permission and the default value is 007, and its mode parameter contains four numbers.

Example

An example of the function is:

<?php
$old = umask(0755);
chmod("text.txt", 0777);
$result=umask($old);
echo "The result is:" .$result;
if ($old != umask())
{
    die('An error occured !');
}
?>

Output


PHP unlink() function

The PHP FileSystem unlink function is used to delete a file and it returns true on success or false on failure.

Syntax  

unlink(filaname,context)

Parameter in unlink  function

The parameters of the function are:
 

Parameter	Description
filename	It specifies the file to delete.
context	It specifies the context of the file handle.

Example

An example of the function is:

<?php

if (!unlink("text.txt"))

  {

  echo ("Error deleting text.txt");

  }

else

  {

  echo ("Deleted your 'text.txt' file");

  }

?>

Output