Home arrow PHP arrow Page 5 - File And Directory Manipulation In PHP (part 2)

The Right Path - PHP

Now that you know the basics of reading and writing files, this second segment of our tutorial on the PHP filesystem API takes you into deeper waters, showing you how to copy, delete and rename files; scan directories; work with uploaded files over HTTP; perform pattern matches on file names; and read and write to processes instead of files.

TABLE OF CONTENTS:
  1. File And Directory Manipulation In PHP (part 2)
  2. Stripping It To The Bone
  3. Fertile Fields
  4. Configuring The System
  5. The Right Path
  6. Move It
  7. Beam Me Up
  8. Diving Into Directories
  9. A Pattern Emerges
  10. Purging The Dead
  11. Size Does Matter
  12. In Process
  13. Disk Full
By: icarus, (c) Melonfire
Rating: starstarstarstarstar / 65
August 21, 2003

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In addition to functions that allow you to obtain information on file sizes, permissions and modification times, PHP also offers a number of functions designed to manipulate file and path names, and split a file path into its constituent components. The two most commonly-used ones here are the basename() function, which returns the filename component of a path, and the dirname() function, which returns the directory name component of a path

The following example demonstrates the basename() and dirname() components in action, by splitting a file path into its constituents:


<?php

// set path
$path = "/usr/local/apache/bin/httpd";

// print filename
echo "File is " . basename($path) . "\r\n";

// print directory name
echo "Directory is " . dirname($path) . "\r\n";

?>

Here's the output:


File is httpd
Directory is /usr/local/apache/bin

You can also use the pathinfo() function to obtain this information - this function returns an associative array containing keys for directory name, file name and file extension. Take a look at this next script, which returns this information for the directory holding the currently executing script.


<?php

// parse current file path
$info = pathinfo($_SERVER['PHP_SELF']);

// print info
print_r($info);

?>

Here's the output:


Array
(
[dirname] => /dev/php
[basename] => fs.php
[extension] => php
)

Finally, you can use the realpath() function to translate relative paths into absolute ones, as below:


<?php

// returns /usr/local/lib
echo realpath("/usr/local/apache/bin/../../lib/");

// returns /lib
echo realpath("../../lib");

?>

You can obtain the script's current working directory by combining the
dirname() function with the special $_SERVER['SCRIPT_FILENAME'] variable,


<?php

echo "Current directory is " . dirname($_SERVER['SCRIPT_FILENAME']);

?>

or with the alternative getcwd() function, as below,


<?php

// get current working directory
echo "Current directory is " . getcwd();

?>

or even through creative use of the realpath() function, as below:


<?php

echo "Current directory is " . realpath(".");

?>



 
 
>>> More PHP Articles          >>> More By icarus, (c) Melonfire
 

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