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<?php
class pig{
//猪的属性
public $name;
public $weight;
public $color;
public $age;
//成员方法
public function addweight($a){
$this->weight=$this->weight+$a;
}
public function minusweight($a){
$this->weight=$this->weight-$a;
}
}
$pig1=new pig();
$pig1->weight=100;
$pig1->addweight(5);
echo $pig1->weight;
?>