PHP の抽象クラスとインターフェイスの違いと選択肢

<?php   
abstract class Father {  
    function meth1() {  
        echo "meth1...<br>";  
    }  
    abstract function meth2();  
    public $var1="var1";  
    public static $var2="var2";  
    const Var3="Var3";  
}  
class Son extends Father {  
    function meth2() {  
        echo "meth2 of Son...<br>";  
    }  
}  
$s=new Son();  
echo $s->var1."<br>";  
echo Father::$var2."<br>";  
echo Father::Var3."<br>";  
  
  
Interface IFather {  
    //public $iVar1="iVar1";        此处接口定义中不能包含成员变量  
    //public static $iVar2="iVar2"; 此处接口定义中不能包含静态变量  
    const iVar3="iVar3";  
    function iMeth1();  
}  
Class ISon implements IFather {  
    function iMeth1() {  
        echo "iMeth1...<br>";  
    }  
}  
$is=new ISon();  
echo IFather::iVar3;  
?>