/zzz_native-spl-type-behaviour-investigation

Investigation of behaviour of the PHP SPL types extension

Primary LanguagePHP

Investigation of behaviour of the PHP SPL types extension, version 0.4.

(The fastest way to enable that mode on Linux Ubuntu and its derivatives is by

sudo php5enmod spl_types
  • before that you need to compile or download and set the extension )

Deterrent summary

SPL types (generic and string dis covered unit now) are hardy predicable, with a lot of unexpected and probably unwanted behaviour. One for all: serializing and unserializing causes value lost - the value of SPL object simply disappears.

####SplType

  • constants

    • __default = null

  • methods

    • __construct($initial_value = self::__default, $strict = false)

  • specifics

    • constructor $initial_value can be if strict
      • null
    • constructor $initial_value can be if not strict
      • false
      • empty string
      • zero integer
      • zero float (0.0)
      • empty array
    • constructor $initial_value can not be (throws UnexpectedValueException)
      • true (its strange, but true)
      • non-zero integer
      • non-zero float
      • non-empty string
      • non-empty array
      • object
      • closure
      • resource

####SplString

  • constants

    • __default = '' (empty string)

  • methods

    • __construct($initial_value = self::__default, $strict = false) the SPL string is not strict by default, unlike the parent SPL type

  • specifics

    • constructor $initial_value can be only string in strict mode; non-string in strict mode always cause UnexpectedValueException or InvalidArgumentException
    • constructor $initial_value can be following values (paired with result) in non-strict mode; de facto it is the standard "to string" cast
      • null => ''
      • false => ''
      • true => '1'
      • string => string
      • integer => (string) integer
      • float => (string) float
    • constructor $initial_value should not be if in non-strict mode; de facto it is the standard "to string" cast
      • array => 'Array' + notice Array to string conversion
    • constructor $initial_value never can be in any mode (cause notice Object of class [class] to string conversion and throws InvalidArgumentException)
      • object
      • closure
      • resource