PHP function to output an array with enum from values

Question

I receive as input an array of values. Example : [3,2,3,1] I need as output an array of enums like this : [Fruits::Banana, Fruits::Pear, Fruits::Banana, Fruits::Apple ]

I Try to do a generic function to do this but I got an error because $enumClassName::class does not work...

function get_ennum_array_from_values( array $values, string $enumClassName ){
  $array_of_enum = [];
  foreach ( $values as $value ){
    if( is_numeric( $value ) ){
      $fvalue = (int) $value;
    }else{
      $fvalue = $value;
    }
    $enum = new ReflectionEnum($enumClassName::class);

    if (enum_exists($enum)) {
      $array_of_enum[] = $enum::tryFrom($fvalue);
    }
  }
  return $array_of_enum;
}

This how I would like to use it :

enum Fruits: int {
  case Apple = 1;
  case Pear = 2;
  case Banana = 3;
}

$array_of_enums = get_ennum_array_from_values( [3,2,3,1], 'Fruits' );

How can I do this or fix this function please ?

Does this answer your question? Getting an PHP enum from dynamic name — Omi Shah
– Omi Shah, Commented May 17, 2023 at 11:49

lezhni · Accepted Answer · 2023-05-16 21:55:21Z

0

Can you put class name (with ::class) as second argument? If yes, than

function get_ennum_array_from_values(array $values, string $enumClassName) {
  if (!enum_exists($enumClassName)) {
    return [];
  }

  $array_of_enum = [];

  foreach ($values as $value) {
    $fvalue = is_numeric($value) ? (int)$value : $value;
    $array_of_enum[] = $enumClassName::tryFrom($fvalue);
  }

  return $array_of_enum;
}

and call it like

$array_of_enums = get_ennum_array_from_values([3,2,3,1], Fruits::class);

answered May 16, 2023 at 21:55

lezhni

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Comments

Duncanmoo · Accepted Answer · 2024-05-01 09:38:14Z

Perhaps you don't need a function?

$array_of_enums = array_map(fn ($case) => Fruits::tryFrom($case), [3,2,3,1]);

Or can I suggest a trait?

which you can use on enums where you are wanting to get an array of enums from an array of values. You could even add a second function to the trait tryFromArrayNames if it is not a backed enum.

trait EnumsFromArray
{
    public static function tryFromArrayValues(array $array): array
    {
        return array_map(fn ($case) => self::tryFrom($case), $array);
    }
}

But if you really want a function:

function get_ennum_array_from_values(array $values, string $enumClassName) {
  if (!enum_exists($enumClassName)) {
    // Or perhaps throw an exception, this would obscure coding errors?
    return [];
  }

  return array_map(fn ($case) => $enumClassName::tryFrom($case), $values);
}

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PHP function to output an array with enum from values

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Perhaps you don't need a function?

Or can I suggest a trait?

But if you really want a function:

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