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Classes and Objects

Not to be confused with the HTML/CSS ‘class’ attribute, a class in PHP may be regarded as a data type. It can contain properties (variables) and methods (functions).  Use new to instantiate an object out of a class. Use -> on an instantiated object to access the object properties and methods. A string may be used as the class name, the method name or the object name.

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<!DOCTYPE html>
<html>
<head></head>
<body><?php

class MyClass{
   public $v=10;  // a property
   function shout(){  // a method
      echo "Hello World! <br />";
   }
   function smile(){  // another method
      echo "Smile World! <br />";
   }
}

$test=new MyClass;
$test->shout();
echo $test->v."<br />";

$s="MyClass";
$test2=new $s;
$test2->smile();

$s="shout";
$test->$s();

$s="test";
$$s->smile();

?></body>
</html>