Help with class hiearchy, common functions between classes...

Traxus · July 23, 2010

As of yesterday, I have just started playing with classes, I'm a complete greenhorn regarding OOP. I'm in the midst of building myself a simple templating engine. I have a question regarding a common function (method?) named EchoIfSet that appears in two classes:

function EchoIfSet ($open_tag, $file_src, $close_tag) {
	if (isset($file_src)){
		echo "\n".$open_tag.$file_src.$close_tag;
	}
}

I know there is a more efficient way to use this in both classes:

<?php
class HtmlHead {
var $Keywords;
var $Description;
var $PageStyles;
var $PageScripts;
//------------------------
var $SectionStyles;
var $SectionScripts;
//------------------------
var $SiteStyles;
var $SiteScripts;
//------------------------
var $CatchAll;

function Constructor() {
	echo "\n<head>";
	echo "\n<meta http-equiv='Content-Type' content='text/html; charset=UTF-8' />";
	echo "\n<meta name='keywords' content='".$this->Keywords."' />";
	echo "\n<meta name='description' content='".$this->Description."' />";
	//------------------------
	$this->EchoIfSet("<script src='", $this->SiteScripts, "' type='text/javascript'></script>"); 
	$this->EchoIfSet("<script src='", $this->SectionScripts, "' type='text/javascript'></script>"); 
	$this->EchoIfSet("<script src='", $this->PageScripts, "' type='text/javascript'></script>"); 
	//------------------------
	$this->EchoIfSet("<link rel='stylesheet' type='text/css' href='", $this->SiteStyles, "' />");
	$this->EchoIfSet("<link rel='stylesheet' type='text/css' href='", $this->SectionStyles, "' />");
	$this->EchoIfSet("<link rel='stylesheet' type='text/css' href='", $this->PageStyles, "' />");
	$this->EchoIfSet(NULL, $this->CatchAll, NULL);
	echo "\n</head>";
}

function EchoIfSet ($open_tag, $file_src, $close_tag) {
	if (isset($file_src)){
		echo "\n".$open_tag.$file_src.$close_tag;
	}
}
}		
?>
<?php
//this one will be called several times on the page
class HtmlBlock {
var $DivId;
var $DivClass;
var $DivContent;
function Constructor() {
	//------------------------
	echo "\n<div";
	$this->EchoIfSet(" id='", $this->DivId, "'");
	$this->EchoIfSet(" class='", $this->DivClass, "'");
	echo ">";
	//------------------------
	$this->EchoIfSet(NULL, $this->DivContent, NULL);
	//------------------------
	echo "\n</div>";
}

function EchoIfSet ($open_tag, $file_src, $close_tag) {
	if (isset($file_src)){
		echo "\n".$open_tag.$file_src.$close_tag;
	}
}
}
?>

But I'm not sure where to look for documentation on this. I did some googling/rtfm regarding subclasses, but all of that documentation seems to be in regards to abstract classes, and if i understand correctly abstract classes should have no functions or variables actually defined in them, its basically a template for other classes...

Can anyone point me towards a tutorial that deals with class hierarchies?

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Help with class hiearchy, common functions between classes...

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