Use of the Try catch custom exception class

1<?PHP2 //define a student class3 classstudent{4      //Student's name5      Private $name;6      //The age of the student7      Private $age;8 9    Public function__construct ($name,$age){Ten  One        $this->setname ($name); A        $this->setage ($age); -   } -    Public functionSetName ($name){ the         $this->name=$name; -   } -    Public functionSetage ($age){ -         if(Is_int($age) &&$age>18&&$age<25){ +          $this->age=$age; -}Else{  +          //throws an exception and logs which student is wrong A          Throw NewStudentexception ($this,$this->name. ' Age error ', 333); at         } -     } -  - } - //Customize a student exception class, - //When it's time to know which student is abnormal in classStudentexceptionextends Exception{ -   to     protected $student; +  -  //we need to rewrite the parent class's construction method the   Public function__construct ($stu,$message,$code){ * //keep track of student information $     $this->student=$stu;Panax Notoginseng  -   //the above is easy to understand the //$this->message= $message; + //$this->code= $code; A  the //Question some doubts about here + ///I understand the code this way: overriding the constructor of the parent class does not get the parent class value, when we need to initialize the parent class constructor method -Parent::__construct ($message,$code); $  } $   Public functiongetstudent () { -         -        return $this-student; the  -      }Wuyi } the //monitor all students and return the information if there is a student error - Try{ Wu       $student 1=NewStudent (' AAA ', 21); -       $student 2=NewStudent (' BBB ', 23); About       $student 3=NewStudent (' CCC ', 19); $       $student 4=NewStudent (' DDD ', 28); -  - } - Catch(studentexception$e){ A       Echo"<pre>"; +       //get all the information about the student who has the error the       Var_dump($e-getstudent ()); -       Echo"Error message occurred:".$e-getMessage (); $ } the?>

Use of the Try catch custom exception class