php-enum | The enum PHP is missing , inspired from SplEnum | SDK library

__construct() The constructor checks that the value exist in the enum__toString() You can echo $myValue, it will display the enum value (value of the constant)getValue() Returns the current value of the enumgetKey() Returns the key of the current value on Enumequals() Tests whether enum instances are equal (returns true if enum values are equal, false otherwise)from() Creates an Enum instance, checking that the value exist in the enumtoArray() 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 classvalues() Returns instances of the Enum class of all Enum constants (constant name in key, Enum instance in value)isValid() Check if tested value is valid on enum setisValidKey() Check if tested key is valid on enum setassertValidValue() Assert the value is valid on enum set, throwing exception otherwisesearch() Return key for searched value