<?php
class a{
const cc = “123”;
public function aa(){
echo self::cc;
echo “\n“;
}
}
class b extends a{
const cc = “b123”;
public function bb(){
echo self::cc;
echo “\n“;
}
}
$a = new a();
$a->aa();
$b = new b();
$b->bb();
$b->aa();
代码！