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class test
{ var $b;
function test() {   $this->b=5; }
function addab($c) {   return $this->b+$c; }
}
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class employee{
      function __construct()....
}
class Manager extents Employee{
     function __construct(){
          parent::_construct();
          echo 'Õâ¸ö×ÓÀàµÄ¸¸À๹Ô캯Êýµ÷ÓÃÁË£¡';
     }
}
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class test{
protected $a=9,$b=2,$c;
   public $d;
    function __set($n,$v) {    $this->$n = $v+2; }
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