Single inheritance, a class inherits properties and methods from only one parent class.

<?php 
class ParentClass 
{ 
	/* Parent class definition */
}
class ChildClass extends ParentClass
{ 
	/* Child class extending ParentClass */
}
?>

Example:

<?php
class Person {
   public function showName(){
      echo "Name: Rahul";
   }
}
class Student extends Person {
   public function showCourse(){
      echo "Course: BCA";
   }
}
$obj = new Student();
$obj->showName();   // from parent class
echo "<br>";
$obj->showCourse(); // from child class
?>

• Person - Parent class
• Student - Child class
• Student inherits Person using extends
• Child class can use parent methods + its own methods