PHP/Class/Reflection Class Hiearchy

get_parent_class: get parent class name

<?php
class Employee {
    private $title;
    private $lastName;
    private $firstName;
    protected $salary;
    private $ratio = 0; 
    
    public function __construct($title, $firstName, $mainName, $salary ) { 
        $this->title     = $title;
        $this->firstName = $firstName;
        $this->lastName  = $mainName;
        $this->salary     = $salary;
    }
    function getSummaryLine() {
        $base  = "$this->title ( $this->lastName, ";
        $base .= "$this->firstName )"; 
        return $base;
    }
}
class Developer extends Employee {
    private $stayYear = 0;
    public function __construct($title, $firstName, $mainName, $salary, $stayYear ) { 
        parent::__construct($title, $firstName, $mainName, $salary );
        $this->stayYear = $stayYear;
    }
    public function getStayLength() {
        return $this->stayYear;
    }
    function getSummaryLine() {
        $base = parent::getSummaryLine();
        $base .= ": playing time - $this->stayYear";
        return $base;
    }
 
}

print get_parent_class( "Developer" );
?>

is_subclass_of: get the subclass

<?php
class Employee {
    private $title;
    private $lastName;
    private $firstName;
    protected $salary;
    private $ratio = 0; 
    
    public function __construct($title, $firstName, $mainName, $salary ) { 
        $this->title     = $title;
        $this->firstName = $firstName;
        $this->lastName  = $mainName;
        $this->salary     = $salary;
    }
    public function firstName() {
        return $this->firstName;
    }
    public function getlastName() {
        return $this->lastName;
    }
    public function setRatio( $num ) {
        $this->ratio=$num;
    }
    public function getRatio() {
        return $this->ratio;
    }
    
    public function getTitle() {
        return $this->title;
    }
    public function getPrice() {
        return ($this->salary - $this->ratio);
    }
    public function getFullName() {
        return "{$this->firstName}" . " {$this->lastName}";
    }
    function getSummaryLine() {
        $base  = "$this->title ( $this->lastName, ";
        $base .= "$this->firstName )"; 
        return $base;
    }
}
class Developer extends Employee {
    private $stayYear = 0;
    public function __construct($title, $firstName, $mainName, $salary, $stayYear ) { 
        parent::__construct($title, $firstName, $mainName, $salary );
        $this->stayYear = $stayYear;
    }
    public function getStayLength() {
        return $this->stayYear;
    }
    function getSummaryLine() {
        $base = parent::getSummaryLine();
        $base .= ": playing time - $this->stayYear";
        return $base;
    }
 
}
$developer = new Developer("A", "A1", "A2", 10.99, 60.33 );
if ( is_subclass_of( $developer, "Employee" ) ) {
    print "Developer is a subclass of Employee\n";
}

?>