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:

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

FileSystem Function in PHP: Part 18

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