Working with Directory Iterators and Proxy Classes with PHP 5 - Developing a final example
(Page 5 of 5 )
As I promised before, below I developed an illustrative example that shows how to obtain useful information about a sample "defaultPath" directory, which also contains two text files called "file1.txt" and "file2.txt" respectively. For this specific example, I listed sequentially the different values outputted when a particular method is called, so you can see more clearly how the proxy class does its business.
Here is the example in question:
try{
// instantiate 'ProxyDirectoryProcessor' object
$pDirProc=new ProxyDirectoryProcessor();
// display path of selected directory
echo $pDirProc->getPath();
/*
displays the following:
defaultPath
*/
// display size of directory entries
echo $pDirProc->getSize();
/*
displays the following:
Size for directory entries are as following:
Size for current element is :0
Size for current element is :0
Size for current element is :29
Size for current element is :29
*/
// display names of directory entries
echo $pDirProc->getFileNames();
/*
displays the following:
Name for directory entries are as following:
Name of current file is : file1.txt
Name of current file is : file2.txt
*/
// display timestamps of directory entries
echo $pDirProc->getTimeStamps();
/*
displays the following:
Timestamps for directory entries are as following:
Timestamp of current file is : 1160523911
Timestamp of current file is : 1160523922
*/
// display last access timestamps of directory entries
echo $pDirProc->getLastTimeStamps();
/*
displays the following:
Last access timestamps for directory entries are as following:
Last access timestamp of current file is : 1160523911
Last access timestamp of current file is : 1160523922
*/
// display inode timestamps of directory entries
echo $pDirProc->getInodeLastTimeStamps();
/*
displays the following:
Last inode modification timestamp for directory entries are
as following:
Last inode modification timestamp of current file is : 1160523911
Last inode modification timestamp of current file is : 1160523922
*/
}
catch(Exception $e){
echo $e->getMessage();
exit();
}
After studying the above example, hopefully you'll have a better background on how the proxy pattern works. As homework, try defining more methods for the directory processor, and for the proxy class as well. Fun is already guaranteed!
Final thoughts
In this two-part series, I introduced the key points concerning the implementation of the proxy pattern in PHP 5. As you hopefully learned, this pattern can be used when you want to avoid an unnecessary instantiation of a particular object, something that eventually can improve the overall performance of your application.
As usual, see you in the next PHP tutorial!
| DISCLAIMER: The content provided in this article is not warranted or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation of best practices. We are not liable for any negative consequences that may result from implementing any information covered in our articles or tutorials. If this is a hardware review, it is not recommended to open and/or modify your hardware. |
