php calls the private method: first define a parent class; then use the private function inside the class; then instantiate the parent class, turn it into an object and assign it to "$obj".
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After instantiating a class, it becomes an object and a private function It can only be used inside the class, not outside the class, that is, on objects, nor in subclasses, such as defining a parent class
class parent{
private function _justForMyself(){
echo "这是私有函数，只能在类内部使用哦";
}
public function forAll(){
echo "这是公共函数，在类外和子类都可以使用";
echo "因为我在类内，可以调用私有函数";
$this->_justForMyself();
}
}Now we instantiate this class and let it become a Object
$obj = new parent();//实例化parent类，让他变成一个对象并赋值给$obj $obj->forAll();//forAll是公共函数，因此这里可以执行看到输出 $obj->_justForMyself();//_justForMyself是私有函数，类外不可使用，因此执行到这里会报错
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