FileSystem Function in PHP: Part 17

Introduction

In this article I describe the PHP FileSystem functions rewind, rmdir, set_file_buffer, stat and symlink. 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

PHP rewind() function

The PHP FileSystem rewind function rewinds the position of a file pointer and it returns true on success or false on failure.

Syntax
 

rewind(file)

Parameter in rewind function

The parameter of the function is:
 

Parameter	Description
file	It specifies the open file.

Example

An example of the function is:

<?php

$filename=fopen("test.txt","r");

echo "file pointer position ".ftell($filename);

fgets($filename);

echo "<br>file pointer position ".ftell($filename);

rewind($filename);

echo "<br>after rewind file pointer position ".ftell($filename);

?>

Output



PHP rmdir() function

The PHP FileSystem rmdir function removes a directory and it returns true on success or false on failure.

Syntax

rmdir(dir,context)

Parameter in rmdir function

The parameters of the function are:

Parameter	Description
dir	It specifies the directory to be removed.
context	It  specifies the context of the file handle.

Example

An example of the function is:

<?php
$folderpath="sharad";
if(!rmdir($folderpath))

{

echo ("could not remove $folderpath");

}

else

{

echo "remove successfully.";

}

?>

Output



PHP set_file_buffer() function

The PHP FileSystem set_file_buffer function is the alias of stream_set_write_buffer function and is also used to set the buffer size of an open file.

Syntax

set_file_buffer(file,buffer)

Parameter in set_file_buffer function

The parameters of the function are:

Parameter	Description
file	It specifies the open file.
context	It  specifies the buffer size in bytes.

Example

An example of the function is:

<?php
$file=fopen("text.txt","w");
$handle=set_file_buffer($file,100);
if($handle)
{
echo "buffer is set";
}
else
{
echo "buffer is not set";
}
?>

Output



PHP stat() function

The PHP FileSystem stat function provides the information about a file and returns an array with the following formats:

Numeric	Associative	Description
0	dev	It specifies device number.
1	ino	It specifies inode number.
2	mode	It specifies inode protection mode.
3	nlink	It specifies number of links.
4	uid	It specifies user id of owners
5	gid	It specifies group id of owners.
6	rdev	It specifies inode device type.
7	size	It specifies size in butes.
8	atime	It specifies the last time of access.
9	mtime	It specifies the last modification time.
10	ctime	It specifies the last inode change time.
11	blksize	It specifies the block size of the file system IO.
12	blocks	It specifies the number of blocks allocated.

Syntax

stat(filename)

Parameter in stat function

The parameter of the function is:

Parameter	Description
filename	It specifies the path to the file.

Example

An example of the function is:

<?php
$stat = stat('test.txt');
echo 'Acces time: ' .$stat['atime']."</br>";
echo 'Number of links: ' .$stat['nlink']."</br>";
echo 'Modification time: ' .$stat['mtime']."<br>";
echo 'Device number: ' .$stat['dev']."</br>";
echo 'Size in Bytes: ' .$stat['size'];
?>

Output



PHP symlink() function

The PHP FileSystem symlink function creates a symbolic link and it returns true on success and false on failure.

Syntax

symlink(target,link)

Parameter in symlink function

The parameters of the function are:

Parameter	Description
target	It specifies the target of the link.
link	It specifies the link name.

Example

An example of the function is:

<?php
$target = 'test.php';
$link = 'abc';
symlink($target, $link);
?>