class?Car?{
???function?__construct()?{
???????print?"父類構(gòu)造函數(shù)被調(diào)用\n";
???}
}
class?Truck?extends?Car?{
???function?__construct()?{
???????print?"子類構(gòu)造函數(shù)被調(diào)用\n";
???????parent::__construct();
???}
}
$car?=?new?Truck();
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