note 114666 added to language.oop5.late-static-bindings
| From: | tamilps2 at gmail dot com | Date: | Thu, 20 Mar 2014 05:42:29 +0000 |
| Subject: | note 114666 added to language.oop5.late-static-bindings | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-198984@lists.php.net to get a copy of this message | ||
I have implemented enum using late static binding.
<?php
interface IEnum {
/**
* Only concrete class should implement this function that should behave as
* an enum.
*
* This method should return the __CLASS__ constant property of that class
*
* @return string __CLASS__
*/
public static function who();
}
abstract class Enum {
/**
* The selected value for the enum implementation
*
* @var mixed
*/
public $value;
public function __construct($value) {
$this->value = $value;
}
/**
* The factory method that creates the corresponding enum class.
*
* @param integer $type
* @return false|\class
*/
public static function Factory($type) {
if (empty($type)) {
return false;
}
// use of late static binding to get the class.
$class = static::who();
if (array_key_exists($type, static::$_enums)) {
return new $class($type);
}
return false;
}
public function getValue() {
return $this->value;
}
public static function getValues() {
return array_keys(static::$_enums);
}
public function getString() {
return static::$_enums[$this->value];
}
public function __toString() {
return static::$_enums[$this->value];
}
}
class Fruits extends Enum implements IEnum {
public static $_enums = array(
1 => 'Apple'
2 => 'Orange'
3 => 'Banana'
)
public static function who() {
return __CLASS__;
}
}
// Usage
// user input from dropdown menu of fruits list
$input = 3;
$fruit = Fruits::Factory($input);
$fruit->getValue(); // 3
$fruit->getString(); // Banana
?>
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Probable Submitter: 115.241.44.27
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Manual Page -- http://php.net/manual/en/language.oop5.late-static-bindings.php
Edit -- https://master.php.net/note/edit/114666
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Del: non-english -- https://master.php.net/note/delete/114666/non-english
Del: in docs -- https://master.php.net/note/delete/114666/in+docs
Del: other reasons-- https://master.php.net/note/delete/114666
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