OO in PHP

[Sanjib Sinha]

I'm from C# background, recently started learning Object Oriented PHP and found it extremely interesting.

As  I have little knowledge about the procedural parts, specially the PHP in-built functions, will it affect my learning or should I start from the classic, procedural way?

[Ken2k7]

Procedural would be C# without classes. You can always program in OO and not procedural. You'll pick up as you move along.

[ChemicalBliss]

If you want a sturdy grounding for PHP in the future, i would start with OOP simply because its not hard to understand.

 

There are a few concepts that confuse people but basically, it means to seperate as much as possible without adding redundant code. So you can reuse your code in any other project that needs that functionality.

 

So if you start in OOP, you will start your Code Base.

 

-CB-

[Sanjib Sinha]

Many thanks for your reply friends. I'm inspired and decided to move on. 

But  I've few questions, to start with I'd like to give a DirectoryItems Class codes where few in-built functions are used.

First the codes:

<?php
class DirectoryItems{
//data members
var $filearray = array();
////////////////////////////////////////////////////////////////////
//constructor
////////////////////////////////////////////////////////////////////
  function DirectoryItems($directory){
	$d = '';
  	if(is_dir($directory))
	{
  		$d = opendir($directory) or die("Couldn't open directory.");
  		while(false !== ($f=readdir($d)))
		{
    		if(is_file("$directory/$f"))
			{
				$this->filearray[]=$f;
    		}
  		}
		closedir($d);
	}else{
		//error
		die('Must pass in a directory.');
	}
}
////////////////////////////////////////////////////////////////////
//public functions
////////////////////////////////////////////////////////////////////
function indexOrder(){
	sort($this->filearray);
}
////////////////////////////////////////////////////////////////////
function naturalCaseInsensitiveOrder(){
	natcasesort($this->filearray);
}
////////////////////////////////////////////////////////////////////
function checkAllImages(){
	$bln=true;
	$extension='';
	$types= array('jpg', 'jpeg', 'gif', 'png');
	foreach ($this->filearray as $value){
		$extension = substr($value,(strpos($value, ".")+1));
		$extension = strtolower($extension);
		if(!in_array($extension, $types)){
			$bln = false;
			break;
		}
	}
	return $bln;
}
////////////////////////////////////////////////////////////////////
function getCount() {
	return count($this->filearray);
}
////////////////////////////////////////////////////////////////////
function getFileArray(){
	return $this->filearray;
}
}//end class
////////////////////////////////////////////////////////////////////
?>

 

Next in this code there are plenty of functions like substr() and strtolower() etc. From my C# programming background I guess what they mean, but where can I get to learn about them in detail?

[PFMaBiSmAd]

http://www.php.net/docs.php

[ignace]

PHP already has plenty of built-in classes have a look at http://php.net/manual/en/book.spl.php

[ChemicalBliss]

just a note, php has a great mod rewrite function, just type:

 

php.net/any function here

 

in yor address bar and it'll try to find the function for you, it will tell you everything u need to know - the comments help a lot too).

 

-cb-

[Ken2k7]

The code is nice. I do have a suggestion though.

 

For this line:

$extension = substr($value,(strpos($value, ".")+1));

 

strpos gets the first occurrence of the string you're finding. Now, it's not at all unheard of for people to have dots in their filename, such as "directory.class.php" or "directory.inc.php". That line would get the wrong "." for the extension. May I suggest you read up on strrpos?

[ignace]

The code is nice. I do have a suggestion though.

 

For this line:

$extension = substr($value,(strpos($value, ".")+1));

 

strpos gets the first occurrence of the string you're finding. Now, it's not at all unheard of for people to have dots in their filename, such as "directory.class.php" or "directory.inc.php". That line would get the wrong "." for the extension. May I suggest you read up on strrpos?

 

Or maybe you should both have a good read of the manual and use pathinfo

[dotMoe]

The code is nice. I do have a suggestion though.

 

For this line:

$extension = substr($value,(strpos($value, ".")+1));

 

 

As stated that is incorrect: proper way of fixing that error, i say is:

pathinfo

or

 

$file = "file.with.dot.txt";
$extension = explode('.',$file);
$extension = $extension[count($extension) - 1];

[ignace]

$file = "file.with.dot.txt";
$extension = explode('.',$file);
$extension = $extension[count($extension) - 1];

 

WTF?!? Does no-one read the manual??? Proper way for this terrible thing would be:

 

$file = "file.with.dot.txt";
$extension = end(explode('.',$file));

[dotMoe]

Thanks, haven't seen the

 

end()

 

function before.