PHP/Class/instance of

instanceof operator

<?php
class Person {
    private $name;    
    private $age;    
    private $id;    
    function __construct( $name, $age ) {
        $this->name = $name;
        $this->age = $age;
    }
    function setId( $id ) {
        $this->id = $id;
    }
    
    function __clone() {
        $this->id = 0;
    }
}
$p = new Person("A",10);
if ( $p instanceof Person  ) {
    print "\$p is a Person object\n";
}
?>

is_a: is a class instance

<?php
class Person {
    private $name;    
    private $age;    
    private $id;    
    function __construct( $name, $age ) {
        $this->name = $name;
        $this->age = $age;
    }
    function setId( $id ) {
        $this->id = $id;
    }
    
    function __clone() {
        $this->id = 0;
    }
}
$p = new Person("A",10);
if ( is_a( $p, "Person" )  ) {
    print "\$p is a Person object\n";
}
?>