Classes define templates for creating objects, while objects are instances of these classes.

Classes:

A class defind using class keyword followed by the class name

<?php
class Car {
    // Class definition goes here
}
?>

Objects:

An object is an instance of a class. 

It is created using the new keyword. 

Here's how you can create an object of the Car class.

<?php
$object = new car();
?>

In this, $object is an object of the Car class. 

Example-

<?php
class Fruit {
    public $name;
    public $color;
    public function color_name() {
        return "This is a $this->color $this->name.";
    }
}
// object create
$obj = new Fruit();
$obj->name = "apple";
$obj->color = "red";
echo $obj->color_name(); // Output: This is a red apple.
?>

• We define a Fruit class with properties $name and $color, and a method color_name().
• We create an object of the Fruit class named $obj.
• We set the properties of the $obj object to "apple" and "red".
• We call the color_name() method of the $obj object, which returns a string describing the fruit's name and color.