Php class

<?php
/**
 * Define MyClass
 */
class MyClass
{
    public $public = 'Public';
    protected $protected = 'Protected';
    private $private = 'Private';

    function printHello()
    {
        echo $this->public;
        echo $this->protected;
        echo $this->private;
    }
}

$obj = new MyClass();
echo $obj->public; // Works
echo $obj->protected; // Fatal Error
echo $obj->private; // Fatal Error
$obj->printHello(); // Shows Public, Protected and Private


/**
 * Define MyClass2
 */
class MyClass2 extends MyClass
{
    // We can redeclare the public and protected properties, but not private
    public $public = 'Public2';
    protected $protected = 'Protected2';

    function printHello()
    {
        echo $this->public;
        echo $this->protected;
        echo $this->private;
    }
}

$obj2 = new MyClass2();
echo $obj2->public; // Works
echo $obj2->protected; // Fatal Error
echo $obj2->private; // Undefined
$obj2->printHello(); // Shows Public2, Protected2, Undefined

?>

Source: php.net

Php class

/*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()`"

?>

Source: php.net

Php class

var numbers = [10, 20, 30, 40] // sums to 100var sum = 0;for (var i = 0; i < numbers.length; i++) {  sum += numbers[i]}

-2

Source: medium.com

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