archived-presentations/slides/advphp/objphpv5.xml

<slide title="PHP5 OO">
<blurb title="Object Model">Object model is brand spanking new!</blurb>
<blurb title="Private">Private and Protected member variables are now available</blurb>
<example fontsize="1.2em" filename="privateprotected.php"/>
<blurb title="Cloning">You are able to make direct copies of objects with PHPv5, furthermore
you can define functions that are called when the objects are copied.</blurb>
<example fontsize="1.2em" filename="clone.php"/>
<blurb title="Nested Classes">In PHPv5 you can have classes within classes.  This allows for many
 neat features, most importantly, classes can function as namespaces.</blurb>
<example fontsize="1.2em" filename="classclass.php"/>
<blurb title="Constants">Classes may now contain constants</blurb>
<example fontsize="1.2em"><![CDATA[<?php
class foo {
    const hey = 'hello';
}

print foo::hey;
?>]]></example>
<blurb title="Importing">You may now import class symbols into the current "namespace"</blurb>
<example fontsize="1.2em"><![CDATA[<?php
class MyClass {
    class MyClass2 {
        function hello() {
            print "Hello, World in MyClass2\n";
        }
    }

    function hello() {
        print "Hello, World\n";
    }
}

import function hello, class MyClass2 from MyClass;

MyClass2::hello();
hello();
?>]]></example>
<blurb title="Unified Constructors and Destructors">
The new OO model will allow for consistency amongst constructors and 
destructors, so they are no longer dependent on they class name (PHPv4 
actually only had the concept of constructors.)
</blurb>
<example fontsize="1.2em"><![CDATA[<?php
class MyDestructableClass {
    function __construct() {
        print "In constructor\n";
        $this->name = 'MyDestructableClass';
    }

    function __destruct() {
        print 'Destroying ' . $this->name . "\n";
    }
}

$obj = new MyDestructableClass();
?>]]>
</example>
<blurb title="Exceptions!">The new OO model will support exceptions ala Java</blurb>
<example fontsize="1.2em" filename="exceptions.php"/>

<blurb title="Object Dereferencing">You can now directly dereference objects 
returned from functions.</blurb>
<example fontsize="1.2em"><![CDATA[<?php
class Circle {
    function draw() {
        print "Circle\n";
    }
}

class Square {
    function draw() {
        print "Square\n";
    }
}

function ShapeFactoryMethod($shape) {
    switch ($shape) {
        case 'Circle': return new Circle();
        case 'Square': return new Square();
    }
}

ShapeFactoryMethod('Circle')->draw();
ShapeFactoryMethod('Square')->draw();

?>]]>
</example>

</slide>