Online PHP editor | rfc for IInDq

@ 2018-05-26T14:22:48Z

<?php

abstract class Price {
    protected $value;
    
    public function __construct($value) {
        $this->value = $value;
    }
    
    // Duck typing means this declaration is actually optional
    abstract protected function getRawValue();
    
    public function getFormattedValue() {
        // Calls a protected method of whichever child class is $this
        return number_format($this->getRawValue(), 2);
    }
}

class TaxFreePrice extends Price {
    protected function getRawValue() {
        return $this->value;
    }
    
    public function add(Price $other) {
        // Calls a protected method of whichever child class is $other
        $this->value += $other->getRawValue();
    }
}

class PriceWithTax extends Price{
    const TAX_RATE=1.2;
    
    protected function getRawValue() {
        return $this->value * self::TAX_RATE;
    }
}

$a = new TaxFreePrice(10);
$b = new PriceWithTax(10);
echo $a->getFormattedValue(), PHP_EOL;
echo $b->getFormattedValue(), PHP_EOL;

// Here, an instance of TaxFreePrice will access a protected member of PriceWithTax
$a->add($b);
echo $a->getFormattedValue(), PHP_EOL;

Output for git.master, git.master_jit, rfc.property-hooks: 10.00 12.00 22.00

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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