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@ 2015-01-12T19:48:22Z

<?php

/**
 * Allows value objects to expose their properties while maintaining immutability.
 * 
 * Define your properties in the docblock for your class with {@code @property}.
 */
class Value
{
    private $a;
    
    public function __construct($a) {
        $this->a = $a;
    }
    
    public function __get($aProperty) {
        if (property_exists($this, $aProperty)) {
            return $this->{$aProperty};
        }
        $this->triggerError("Undefined property: %s::$%s", $aProperty);
    }
    
    public function __set($aProperty, $aValue) {
        if (property_exists($this, $aProperty)) {
            $this->triggerError("Cannot access private property %s::$%s", $aProperty);
        }
        $this->triggerError("Undefined property: %s::$%s", $aProperty);
    }
    
    private function triggerError($message, $aProperty) {
        $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
        throw new ErrorException(sprintf($message, __CLASS__, $aProperty), 0, E_USER_NOTICE, $backtrace[2]['file'], $backtrace[2]['line']);
    }
}

$v = new Value(1);

var_dump($v->a);
var_dump($v->b);
$v->a = 3;
$v->b = 4;

Output for git.master, git.master_jit: int(1) Warning: Undefined array key 2 in /in/TIQNE on line 32 Warning: Trying to access array offset on value of type null in /in/TIQNE on line 32 Warning: Undefined array key 2 in /in/TIQNE on line 32 Warning: Trying to access array offset on value of type null in /in/TIQNE on line 32 Fatal error: Uncaught ErrorException: Undefined property: Value::$b in /in/TIQNE:32 Stack trace: #0 /in/TIQNE(20): Value->triggerError('Undefined prope...', 'b') #1 /in/TIQNE(39): Value->__get('b') #2 {main} thrown in /in/TIQNE on line 32
Process exited with code 255.
Output for rfc.property-hooks: int(1) Warning: Undefined array key 2 in /in/TIQNE on line 32 Warning: Trying to access array offset on null in /in/TIQNE on line 32 Warning: Undefined array key 2 in /in/TIQNE on line 32 Warning: Trying to access array offset on null in /in/TIQNE on line 32 Fatal error: Uncaught ErrorException: Undefined property: Value::$b in /in/TIQNE:32 Stack trace: #0 /in/TIQNE(20): Value->triggerError('Undefined prope...', 'b') #1 /in/TIQNE(39): Value->__get('b') #2 {main} thrown in /in/TIQNE on line 32
Process exited with code 255.

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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