PHP Enum implementation

This package offers enums in PHP. We don't use a simple "value" representation, so you're always working with the enum object. This allows for proper autocompletion and refactoring in IDEs.

Why?

Using an enum instead of class constants provides the following advantages:

• You can enrich the enum with alias methods names (e.g. draft(), published(), …)
• You can extend the enum to add new values (make your enum final to prevent it)
• You can get a list of all the possible values (see below)

This Enum class is not intended to replace class constants, but only to be used when it makes sense.

Installation

composer require xaamin/enum

Declaration

use Xaamin\Enum\Enum;

class InvoiceStatus extends Enum
{
    protected $enum = [
        'pending' => 'invoice.pending',
        'paid' => 'invoice.paid',
        'overdue' => 'invoice.overdue',
    ];
}

Documentation

• getName() Returns the name of the current value on Enum
• getValue() Returns the current value of the enum
• equals($enum) Tests whether 2 enum instances are equal (returns true if enum values are equal, false otherwise)

Static methods:

• toArray() method Returns all possible values as an array (constant name in key, constant value in value)
• keys() Returns the names (keys) of all constants in the Enum class
• values() Returns instances of the Enum class of all Enum constants (constant name in key, Enum instance in value)
• search() Return key for the searched value

Static methods

class InvoiceStatus extends Enum
{
    protected $enum = [
        'pending' => 'invoice.pending',
        'paid' => 'invoice.paid',
        'overdue' => 'invoice.overdue',
    ];
}

// Static method:
$invoice = InvoiceStatus::pending();
$invoice = InvoiceStatus::paid();

You can use phpdoc for autocompletion, this is supported in some IDEs:

/**
 * @method static self pending()
 * @method static self paid()
 * @method static self overdue()
 */
class InvoiceStatus extends Enum
{
    protected $enum = [
        'pending' => 'invoice.pending',
        'paid' => 'invoice.paid',
        'overdue' => 'invoice.overdue',
    ];
}

Usage

This is how an enum can be defined.

/**
 * @method static self pending()
 * @method static self paid()
 * @method static self overdue()
 */
class InvoiceStatus extends Enum
{
    protected $enum = [
        'pending' => 'invoice.pending',
        'paid' => 'invoice.paid',
        'overdue' => 'invoice.overdue',
    ];
}

This is how they are used:

public function setInvoiceStatus(InvoiceStatus $invoice)
{
    $this->invoice = $invoice;
}

// ...

$class->setInvoiceStatus(InvoiceStatus::paid());

This is how get we can get the enum name from a value:

$invoice = InvoiceStatus::search('invoice.overdue');

// $invoice is 'overdue'

Creating an enum from a value

$invoice = InvoiceStatus::make('paid');

Comparing enums

Enums can be compared using the equals method:

$invoice->equals($invoice);

You can also use dynamic is methods:

// return a boolean
$invoice->isPaid();

// return a boolean
InvoiceStatus::isPaid($invoice);

Note that if you want auto completion on these is methods, you must add extra doc blocks on your enum classes.

Search

You can search enum with its textual value:

$invoice = InvoiceStatus::search('invoice.pending');

// $invoice is 'pending'