PHP encapsulation without class?

Question

Is it possible to encapsulate, a variable or function let say, in PHP without wrapping them in a class? What I was doing is:

//Include the file containing the class which contains the variable or function include('SomePage.php'); //Instantiate the class from "SomePage.php" $NewObject = new SomeClassFromSomePage(); //Use the function or variable echo $NewObject->SomeFuncFromSomeClass(); echo $NewObject->SomeVarFromSomeClass;

My intention is to avoid naming conflict. This routine, although it works, makes me tired. If I cannot do it without class, it is possible not to instantiate a class? and just use the variable or function instantly?

You probably want to use a factory method (or companion procedure) for that. If the creation of the variable depends on previous method invocation, then you also need fluent chaining. — mario
– mario, Commented Aug 10, 2011 at 1:55
@domanokz Can you describe what you mean by "avoid naming conflict"? — Phil
– Phil, Commented Aug 10, 2011 at 1:57
@Phil I might have the same $x in main page and the included page. — kazinix
– kazinix, Commented Aug 10, 2011 at 2:00

Michael Berkowski · Accepted Answer · 2011-08-10 02:01:15Z

3

To use class methods and variables without instantiating, they must be declared static:

class My_Class { public static $var = 123; public static function getVar() { return self::var; } } // Call as: My_Class::getVar(); // or access the variable directly: My_Class::$var;

With PHP 5.3, you can also use namespaces

namespace YourNamespace; function yourFunction() { // do something... } // While in the same namespace, call as yourFunction(); // From a different namespace, call as YourNamespace\yourFunction();

edited Aug 10, 2011 at 2:01

answered Aug 10, 2011 at 1:53

Michael Berkowski

271k47 gold badges450 silver badges395 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

kazinix Over a year ago

In this case how do I use the $var? or the $getVar?

Michael Berkowski Over a year ago

@domanokz See the additions I made, probably while you were typing your comment

kazinix Over a year ago

Thanks, but the double colon is new to me, must I use :: instead of ->?

Phil Over a year ago

@domanokz Yes. See php.net/manual/en/language.oop5.paamayim-nekudotayim.php

Michael Berkowski Over a year ago

@domanokz Static methods and properties are accessed with the double colon scope operator, while methods and properties of an instantiated class are accessed with the ->

sanmai · Accepted Answer · 2011-08-10 02:18:15Z

2

PHP Namespaces were made to archive the exact same goal:

<?php // foo.php namespace Foo; function bar() {} class baz { static $qux; } ?>

When using call namespaced functions like this:

<?php //bar.php include 'foo.php'; Foo\bar(); Foo\baz::$qux = 1; ?>

edited Aug 10, 2011 at 2:18

answered Aug 10, 2011 at 2:00

sanmai

31.2k12 gold badges72 silver badges76 bronze badges

2 Comments

Phil Over a year ago

I think @domanokz wants to avoid variable name conflicts. Namespaces do not solve this, see stackoverflow.com/questions/5287315/…

sanmai Over a year ago

@Phil static class variable is the only option here, as I see

proseosoc · Accepted Answer · 2022-04-30 03:19:13Z

This is a way to encapsulate without Class

<?php (function (){ $xyz = 'XYZ'; })(); echo $xyz; // warning: undefined

Encapsulation Alternative

With this method you can minimize unintentional using array key(uses it instead of variables). Can also use value stored in array anywhere after assigning. Shorter array key area length with variable in keys, inside encapsulation function; outside encapsulation function, variables can be used in keys but otherwise long discriptive keys. Nested encapsulation can also be used.

Example

<?php define('APP', 'woi49f25gtx'); (function () { $pre = 'functions__math__'; // "functions" is main category, "math" is sub. $GLOBALS[APP][$pre . 'allowedNumbers'] = [3,5,6]; $GLOBALS[APP][$pre . 'square'] = function ($num) { return $num * $num; }; $GLOBALS[APP][$pre . 'myMathFunction'] = function ($num) use ($pre) { if(in_array($num,$GLOBALS[APP][$pre . 'allowedNumbers'])) return 'not allowed'; return $GLOBALS[APP][$pre . 'square']($num); }; })(); echo $GLOBALS[APP]['functions__math__myMathFunction'](4);

Collectives™ on Stack Overflow

PHP encapsulation without class?

3 Answers 3

5 Comments

2 Comments

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

5 Comments

2 Comments

Comments

Linked

Related