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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()`"
?>
2004-10-05 19:04:09
http://php5.kiev.ua/manual/ru/language.oop5.html
We can also access function like this. It looks strange but it works.

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

$foo = new Foo;

function 
getVarName()
{
     return 
'aFuncName'
}

print 
$foo->{$foo->{getVarName()}}();
2020-04-05 09:57:43
http://php5.kiev.ua/manual/ru/language.oop5.html

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