person_class_01.php

<?php

class Person {

     //-----------------------------
     // private properites
     private $_name;
     private $_dateofbirth;
     private $_weight;

     //-----------------------------
     // constructor
     public function __construct( $name, $dateofbirth, $weight )
     {
        $this->_name   = $name;
        $this->_dateofbirth = $dateofbirth;
        $this->_weight = $weight;
     }

     //-----------------------------
     // methods that return information about the person
     public function get_name()
     {
         return $this->_name;
     }

     public function get_dateofbirth()
     {
         return $this->_dateofbirth;
     }

     public function get_age()
     {
         $today = new DateTime();
         $diff = $today->diff(new DateTime($this->_dateofbirth));
         return $diff->y;
     }

     public function get_weight()
     {
         return $this->_weight;
     }

     //-----------------------------
     // methods that change values of properties
     public function change_name($name)
     {
         $this->_name = $name;
     }

     public function add_weight($weight)
     {
         $this->_weight = $this->_weight + $weight;
     }

     public function lose_weight($weight)
     {
         $this->_weight = $this->_weight - $weight;
     }

     //-----------------------------
     // print the person details
     public function printall()
     {
        echo("<br/>-------------------------------------------------------------<br/>");
        echo("NAME: " . $this->_name . " DATEOFBIRTH: " . $this->_dateofbirth . " WEIGHT: " . $this->_weight . "<br/>");
        echo("-------------------------------------------------------------<br/><br/>");
     }

}
?>
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https://www.paulvgibbs.com/learn-php-and-mysql-web-programming/code-samples/chapter-19/person_class_01-php/