PHP class constants, private, public properties and functions
This is a very simple php class that demonstrates the usage of php class constant, private property, public property, private function and public function.
<?php class Dog { const KIND = 'Mammal'; public $name; private $dob; function __construct($name, $dob) { $this->name = $name; $this->dob = $dob; } public function speak() { echo "Woof, I am a ".self::KIND.". My name is $this->name, I am ".$this->calculateAge()." years old."; } private function calculateAge() { $currentYear = date('Y'); return intval($currentYear) - intval(substr($this->dob,0,4)); } } $dog = new Dog("Kimi","2013/03/02"); echo $dog->speak();//Woof, I am a Mammal. My name is Kimi, I am 1 years old.Kimi echo Dog::KIND;//Mammal echo $dog::KIND;//Mammal echo $dog->name;//Kimi echo $dog->dob;//Fatal error: Cannot access private property Dog::$dob echo $dog->calculateAge();//Fatal error: Call to private method Dog::calculateAge() from context ?>
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