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PHP Beginning OOP

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These are important object oriented principles (OOP) that one must understand in PHP to create dynamic web applications. I hope you find this useful in understanding inheritance.

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  1. <?php 
  2. /*
  3.  * Author: Alvin Crespo
  4.  * Date: 2/23/2010
  5.  * 
  6.  * Employee Class is the parent for the Manager subclass
  7.  * 
  8.  * */
  9.  
  10. class Employee{
  11.  
  12. 	protected $fname; //protected variables and functions are passed to the subclass
  13. 	protected $lname;
  14. 	protected $salary = 32000;
  15. 	protected $position;
  16.  
  17. 	function __construct($firstname, $lastname, $position){
  18. 		/*
  19. 		 * Methods pertaining to this class
  20. 		 * 
  21. 		 * */
  22. 		$this->SetFirstName($firstname);
  23. 		$this->SetLastName($lastname);
  24. 		$this->SetPosition($position);
  25. 	}
  26.  
  27. 	/*
  28. 	 * User Private Information
  29. 	 * 
  30. 	 * */
  31. 	protected function SetLastName($lastname){
  32. 		$this->lname = $lastname;
  33. 	}
  34. 	protected function SetFirstName($firstname){
  35. 		$this->fname = $firstname;
  36. 	}	
  37. 	public function GetFirstName(){
  38. 		return $this->fname;
  39. 	}
  40. 	public function GetLastName(){
  41. 		return $this->lname;
  42. 	}
  43.  
  44. 	/*
  45. 	 *User Work Information
  46. 	 * 
  47. 	 * */
  48. 	protected function SetSalary($salary){
  49. 		$this->salary = $salary;
  50. 	}
  51. 	public function GetSalary(){
  52. 		return "$".$this->salary;
  53. 	}
  54. 	protected function SetPosition($position){
  55. 		$this->position = $position;
  56. 	}
  57. 	public function GetPosition(){
  58. 		return $this->position;
  59. 	}
  60.  
  61. 	function __destruct(){
  62.  
  63. 	}
  64. }
  65.  
  66. ?>
  67.  
  68. <?php 
  69.  
  70. /*
  71.  * Author: Alvin Crespo
  72.  * Date: 2/23/2010
  73.  * 
  74.  * Class Manager is a sublass to Employee 
  75.  * 
  76.  * */
  77.  
  78. class Manager extends Employee{
  79.  
  80. 	function __construct($fname, $lname){
  81. 		/*
  82. 		 * These methods are located in the parent class Employee
  83. 		 * 
  84. 		 * */
  85. 		$this->SetLastName($lname);
  86. 		$this->SetFirstName($fname);
  87. 		$this->SetSalary(48000);
  88. 		$this->SetPosition('Manager');
  89. 	}
  90.  
  91. 	function __destruct(){
  92.  
  93. 	}
  94. }
  95. ?>
  96.  
  97. /* This is what you would do in your .php file calling these functions*/
  98.  
  99. 	<?php 
  100. 		require_once 'classes/Employee.php';
  101. 		require_once 'classes/Manager.php';
  102.  
  103. 		$employee = new Employee('jack','smith','Copywriter');
  104. 		echo "First Name: " . $employee->GetFirstName();
  105. 		echo "<br/>";
  106. 		echo "Last Name: " . $employee->GetLastName();
  107. 		echo "<br/>";
  108. 		echo "Salary: " . $employee->GetPosition();
  109. 		echo "<br/>";
  110. 		echo "Salary: " . $employee->GetSalary();
  111.  
  112. 		echo "<br/><br/>";
  113. 		$manager = new Manager('frank','josom');
  114. 		echo "First Name: " . $manager->GetFirstName();
  115. 		echo "<br/>";
  116. 		echo "Last Name: " . $manager->GetLastName();
  117. 		echo "<br/>";
  118. 		echo "Salary: " . $manager->GetPosition();
  119. 		echo "<br/>";
  120. 		echo "Salary: " . $manager->GetSalary();
  121. 	?>

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