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joostvanveenjoostvanveen
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Lesson 12: Class inheritance and protected scope
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‎12_class_inheritance_and_protected_scope/Acme/App/Administrator.php

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<?php
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namespace Acme\App;
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/**
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* This class extends Acme\App\User
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*/
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class Administrator extends User {
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public function __construct() {
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$this->isAdmin = true;
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}
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/**
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* Return the result of the login()
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*/
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public function getLogin ()
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{
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// The login method in the parent class is accessible from here,
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// because it is protected.
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return $this->login();
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}
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/**
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* This method is for Administrators only
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*/
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public function reportForDuty ()
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{
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// Do stuff ...
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}
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}

‎12_class_inheritance_and_protected_scope/Acme/App/User.php

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<?php
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namespace Acme\App;
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class User {
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/**
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* @var string
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*/
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protected $email;
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/**
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* @var string
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*/
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protected $password;
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/**
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* @var boolean
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*/
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protected $isAdmin = false;
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/**
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* All properties that can be set directly
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* @var array
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*/
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protected $fillable = array('email', 'password');
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/**
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* All properties that can be gotten directly
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* @var array
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*/
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protected $accessible = array('email', 'password');
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/**
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* Class configuration only
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* @param array $params
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*/
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public function __construct(Array $params = array()) {
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if (count($params)) {
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foreach ($params as $key => $value) {
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$this->$key = $value;
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}
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}
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}
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/**
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* Directly set inaccessible but existing properties, if in $this->fillable array
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* @param string $name
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* @param mixed $value
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* @return void
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*/
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public function __set ($name, $value) {
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// Do not set if not fillable
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if (! in_array($name, $this->fillable)) {
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return false;
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}
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if (isset($this->$name)) {
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$this->$name = $value;
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}
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}
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/**
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* Directly get inaccessible but existing properties, if in $this->accesible array
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* @param string $name
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* @return mixed
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*/
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public function __get ($name) {
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// Do not return if not accessible
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if (! in_array($name, $this->accessible)) {
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return NULL;
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}
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return isset($this->$name) ? $this->$name : NULL;
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}
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/**
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* Return accessible properties as a json object
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* @return string
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*/
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public function __toString () {
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$data = array();
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// Only add property accessible
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foreach ($this->accessible as $key) {
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$data[$key] = $this->$key;
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}
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return json_encode($data);
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}
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/**
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* Log in a user
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* @return string
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*/
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public function login(){
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return 'Logging in with a vengeange ...';
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}
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/**
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* Log in a user
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* @return string
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*/
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public function logout(){
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return 'Logging out ...';
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}
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}

‎12_class_inheritance_and_protected_scope/Acme/App/Validator.php

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<?php
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namespace Acme\App;
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class Validator
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{
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/**
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* Validation errors
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* @var array
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*/
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private $errors = array();
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/**
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* Validate data against a set of rules and set errors in the $this->errors
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* array
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* @param array $data
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* @param array $rules
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* @return boolean
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*/
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public function validate (Array $data, Array $rules)
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{
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$valid = true;
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foreach ($rules as $item => $ruleset) {
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// required|email|min:8
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$ruleset = explode('|', $ruleset);
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foreach ($ruleset as $rule) {
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$pos = strpos($rule, ':');
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if ($pos !== false) {
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$parameter = substr($rule, $pos + 1);
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$rule = substr($rule, 0, $pos);
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}
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else {
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$parameter = '';
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}
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// validateEmail($item, $value, $param)
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$methodName = 'validate' . ucfirst($rule);
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$value = isset($data[$item]) ? $data[$item] : NULL;
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if (method_exists($this, $methodName)) {
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$this->$methodName($item, $value, $parameter) OR $valid = false;
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}
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}
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}
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return $valid;
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}
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/**
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* Get validation errors
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* @return array:
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*/
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public function getErrors ()
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{
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return $this->errors;
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}
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/**
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* Validate the $value of $item to see if it is present and not empty
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* @param string $item
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* @param string $value
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* @param string $parameter
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* @return boolean
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*/
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private function validateRequired ($item, $value, $parameter)
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{
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if ($value === '' || $value === NULL) {
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$this->errors[$item][] = 'The ' . $item . ' field is required';
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return false;
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}
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return true;
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}
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/**
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* Validate the $value of $item to see if it is a valid email address
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* @param string $item
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* @param string $value
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* @param string $parameter
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* @return boolean
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*/
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private function validateEmail ($item, $value, $parameter)
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{
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if (! filter_var($value, FILTER_VALIDATE_EMAIL)) {
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$this->errors[$item][] = 'The ' . $item . ' field should be a valid email addres';
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return false;
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}
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return true;
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}
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/**
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* Validate the $value of $item to see if it is fo at least $param
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* characters long
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* @param string $item
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* @param string $value
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* @param string $parameter
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* @return boolean
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*/
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private function validateMin ($item, $value, $parameter)
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{
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if (strlen($value) >= $parameter == false) {
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$this->errors[$item][] = 'The ' . $item . ' field should have a minimum length of ' . $parameter;
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return false;
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}
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return true;
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}
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}

‎12_class_inheritance_and_protected_scope/Acme/Library/User.php

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<?php
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namespace Acme\Library;
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class User
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{
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/**
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* A private property or method is only accessible from the class itself
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*/
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private $foo;
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/**
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* A protected property or method is accessible only from the class
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* itself AND from it's children classes.
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*/
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protected $bar;
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/**
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* A public property or method is accessible from anywhere.
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*/
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public $baz;
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/**
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* Log in a user
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* @return string
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*/
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protected function login(){
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return 'Logging in from User class ...';
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}
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}
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‎12_class_inheritance_and_protected_scope/Helper.php

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<?php
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/**
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* Create a hash
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* @param string $string
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* @return string
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*/
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function getHash($string){
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return hash('sha256', $string);
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}

‎12_class_inheritance_and_protected_scope/autoload.php

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<?php
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/**
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* Let's require our helper file with helper functions here
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*/
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require 'Helper.php';
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/**
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* PSR-0 autoloader
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* @param string $className
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*/
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function autoload($className)
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{
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$className = ltrim($className, '\\');
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$fileName = '';
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$namespace = '';
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if ($lastNsPos = strrpos($className, '\\')) {
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$namespace = substr($className, 0, $lastNsPos);
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$className = substr($className, $lastNsPos + 1);
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$fileName = str_replace('\\', DIRECTORY_SEPARATOR, $namespace) . DIRECTORY_SEPARATOR;
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}
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$fileName .= str_replace('_', DIRECTORY_SEPARATOR, $className) . '.php';
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require $fileName;
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}
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/**
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* Register the PSR-0 autoloader
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*/
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spl_autoload_register('autoload');

‎12_class_inheritance_and_protected_scope/index.php

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<?php
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// Require psr-0 autoloader
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require 'autoload.php';
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// Set data and validation rules
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$rules = array('email' => 'required|email', 'password' => 'required|min:8');
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$data = array('email' => 'joost@tutsplus.com', 'password' => '12346789', 'foo' => 'bar');
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// Run validation
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$validator = new Acme\App\Validator();
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if ($validator->validate($data, $rules) == true) {
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$joost = new Acme\App\Administrator();
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echo $joost->login();
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}
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else {
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// Validation failed. Dump validation errors.
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var_dump($validator->getErrors());
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}

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