KeretModell

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szoveg

http://php.net/manual/en/language.oop5.php

PHP 5 is very very flexible in accessing member variables and member functions. These access methods maybe look unusual and unnecessary at first glance; but they are very useful sometimes; specially when you work with SimpleXML classes and objects. I have posted a similar comment in SimpleXML function reference section, but this one is more comprehensive.

I use the following class as reference for all examples:

<?php 
class Foo { 
    public $aMemberVar = ~~aMemberVar Member Variable~~; 
    public $aFuncName = ~~aMemberFunc~~; 
    
    
    function aMemberFunc() { 
        print ~~Inside `aMemberFunc()`~~; 
    } 
}

$foo = new Foo; 
?>

You can access member variables in an object using another variable as name:

<?php 
$element = ~~aMemberVar~~; 
print $foo->$element; // prints ~!aMemberVar Member Variable~! 
?>

or use functions:

<?php 
function getVarName() 
{ return ~~aMemberVar~~; }

print $foo->{getVarName()}; // prints ~!aMemberVar Member Variable~! 
?>

Important Note: You must surround function name with { and } or PHP would think you are calling a member function of object ~!foo~!.

you can use a constant or literal as well:

<?php 
define(MY_CONSTANT, ~~aMemberVar~~); 
print $foo->{MY_CONSTANT}; // Prints ~!aMemberVar Member Variable~! 
print $foo->{~~aMemberVar~~}; // Prints ~!aMemberVar Member Variable~! 
?>

You can use members of other objects as well:

<?php 
print $foo->{$otherObj->var}; 
print $foo->{$otherObj->func()}; 
?>

You can use mathods above to access member functions as well:

<?php 
print $foo->{~~aMemberFunc~~}(); // Prints ~!Inside `aMemberFunc()`~! 
print $foo->{$foo->aFuncName}(); // Prints ~!Inside `aMemberFunc()`~! 
?>

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