Online PHP editor | rfc for EWJs2

@ 2019-01-10T22:23:50Z

<?php

trait Singleton {
    # Holds Parent Instance
    private static  $_instance;
    # Holds Current zval
    private         $_arg;

    # No Direct Need For This Other Than Stopping Call To new Class
    private function __construct() {}

    # Singleton Design
    public static function getInstance() {
        return self::$_instance ?? (self::$_instance = new self());
    }

    # Store a reference of the variable to share the zval
    # Needed to re-pass the variable by reference to share the zval to _arg
    public function bindArg(&$arg) { $this->_arg =& $arg; }

    # Output the value of the stored reference if exists
    public function helloWorld() { echo $this->_arg ?? 'Did not exist.'; }
}

final class Test {
    use \Singleton { helloWorld as public peekabo; }
}

Test::getInstance()->bindArg($row);

foreach(['Hello', ',', ' World'] as $row)
    Test::getInstance()->peekabo();

Output for git.master, git.master_jit, rfc.property-hooks: Hello, World

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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