A brief analysis of PHP object-oriented public private protected access modifier_PHP tutorial

class Woman{
public $name = "gaojin";
protected $age = "22";
private $height = "170";
Function info () {
Echo $ this-& gt; name;
}
Private Function say () {
Echo "This is a private method";
}
}
//$w = new Woman();
//echo $w->info();
//echo $w->name;//Public properties can be accessed
/ /echo $w->age;// Protected attribute, report fatal error
//echo $w->height;// Protected attribute, report fatal error
//Private method, access error
//$w->say(); // Private method, access error
class Girl extends Woman{
// You can redefine the public and protected methods of the parent class, but you cannot define private methods
//protected $name = "jingao"; // You can redefine
function info(){
echo $this->name;
echo $this->age;
echo $this->height;
}
function say(){
//parent::say();//Private methods cannot be inherited If the parent class's say method is protected here No error will be reported
echo "I am a girl";
}
}
$g = new Girl();
$g->say();//Normal output
//echo $g->height;//The private attribute cannot be accessed and no result is output
//$g->info();//This is the output gaojin22 $height is a private attribute and has not been Inherit
//$g->height ="12";//The height attribute is redefined and assigned a value
//$g->info();//So gaojin2212 will be output here