在php中访问实例变量

Question

I have written this code I want to increment $age value, $age is declared as static variable of class how to access $age varible and increment its value i am learning the basics please help me guyz

<?php
class Person{
    public $age;
   public function __construct($initialAge){
          // Add some more code to run some checks on initialAge
       if($initialAge<0)
       {
           echo"Age is not valid, setting age to 0.\n";
           $age=0;

       }
       else{
           $age=$initialAge;

       }

    }
   public  function amIOld(){
            // Do some computations in here and print out the correct statement to the console 
       if($age<13){
           echo"You are young.\n"; echo $age;
       }
       else if($age>=13 && $age<18)
       {
            echo"You are a teenager.\n";  
       }
       else{
           echo"You are old.\n"; 

       }

    }
   public  function yearPasses(){
          // Increment the age of the person in here
            $age+=1;
    }


}

Answer 1

Can you please try bellow something like this
$this->age+=1;

$this is point to current class