How to Cast Objects in PHP

Question

Ive some classes that share some attributes  and i would like to do something like    dog    Dog   cat    is it possible or is there any generic work around   Its not a superclass  or a interface or related in any way  They are just 2 different classes i would like php map the attributes from a cat class to a dog and give me the new object       i guess i have to specify a little bit more cause seem like a senseless thing to do   i ve classes that inherits from different parent classes cause i ve made an inheritance tree based on the saving method  maybe my bad from the beginning  but the problem is that i have a lot of classes that are practically equal but interacts one with mysql and the other one with xml files  so  i have   class MySql SomeEntity extends SomeMysqlInteract     and   Xml SomeEntity extends SomeXmlInteract     its a little bit deeper tree but the problem its that  i cant make them inherits from the same class cause multiple inheritance is not allowed  and i cant separate current interaction with superclases cause would be a big trouble   Basically the attributes in each one are practical the same   since i have a lot of this matching classes i would like to do some generic casting or something like it that can converts  pass the values to each attribute  and but im trying to search the simplest way to everyone of this classes

User · Answer

You may think about factories  class XyFactory       public function createXyObject   other             new   new XyObject  other- gt someValue              Do other things  that let  new look like  other  except the used class          return  new            Otherwise user250120s solution is the only one  which comes close to class casting

User · Answer

You do not need casting  Everything is dynamic   I have a class Discount  I have several classes that extends this class  ProductDiscount StoreDiscount ShippingDiscount        Somewhere in the code I have    pd   new ProductDiscount     pd- gt setDiscount 5  ProductDiscount  PRODUCT DISCOUNT PERCENT    pd- gt setProductId 1     this- gt discounts      pd           sd   new StoreDiscount     sd- gt setDiscount 5  StoreDiscount  STORE DISCOUNT PERCENT    sd- gt setStoreId 1     this- gt discounts      sd    And somewhere I have     foreach   this- gt discounts as  discount        if   discount- gt getDiscountType    Discount  DISCOUNT TYPE PRODUCT             productDiscount    discount     you do not need casting           amount    productDiscount- gt getDiscountAmount  this- gt getItemTotalPrice                            foreach   Where getDiscountAmount is ProductDiscount specific function  and getDiscountType is Discount specific function

User · Answer

There is no built-in method for type casting of user defined objects in PHP  That said  here are several possible solutions   1  Use a function like the one below to deserialize the object  alter the string so that the properties you need are included in the new object once it s deserialized   function cast  obj   to class      if class exists  to class          obj in   serialize  obj        obj out    O     strlen  to class            to class          substr  obj in   obj in 2    7       return unserialize  obj out         else     return false      2  Alternatively  you could copy the object s properties using reflection   manually iterating through them all or using get object vars     This article should enlighten you on the  dark corners of PHP  and implementing typecasting on the user level

User · Answer

You can use above function for casting not similar class objects   PHP    5 3          Class casting        param string object  destination     param object  sourceObject     return object     function cast  destination   sourceObject        if  is string  destination              destination   new  destination               sourceReflection   new ReflectionObject  sourceObject        destinationReflection   new ReflectionObject  destination        sourceProperties    sourceReflection- gt getProperties        foreach   sourceProperties as  sourceProperty             sourceProperty- gt setAccessible true            name    sourceProperty- gt getName             value    sourceProperty- gt getValue  sourceObject           if   destinationReflection- gt hasProperty  name                  propDest    destinationReflection- gt getProperty  name                propDest- gt setAccessible true                propDest- gt setValue  destination  value             else                destination- gt  name    value                      return  destination      EXAMPLE   class A      private   x        class B      public   x         a   new A     b   new B      x   cast  A   b    x   cast  B   a

User · Answer

If the object you are trying to cast from or to has properties that are also user-defined classes  and you don t want to go through reflection  you can use this    lt  php declare strict types 1   namespace Your Namespace Here     use Zend Logger     or your logging mechanism of choice   final class OopFunctions                     param object  from         param object  to         param Logger  logger                return object              static function Cast  from   to   logger               logger- gt debug  from          fromSerialized   serialize  from          fromName   get class  from          toName   get class  to          toSerialized   str replace  fromName   toName   fromSerialized          toSerialized   preg replace   O  d                 O     strlen  toName         1    toSerialized          toSerialized   preg replace callback            s  d                         function   matches                       arr   explode       matches 0               arr 1    mb strlen  arr 2   - 2            return implode       arr                        toSerialized                 to   unserialize  toSerialized          logger- gt debug  to         return  to

User · Answer

a better aproach   class Animal       private   name   null       public function   construct  name   null                 this- gt  name    name                        casts object         param Animal  to         return Animal             public function cast  to                if   to instanceof Animal                 to- gt  name    this- gt  name            else               throw new Exception  cant cast     get class  this      to     get class  to             return  to             public function getName                 return  this- gt  name           class Cat extends Animal       private   preferedKindOfFish   null       public function   construct  name   null   preferedKindOfFish   null                parent    construct  name            this- gt  preferedKindOfFish    preferedKindOfFish                        casts object         param Animal  to         return Animal             public function cast  to                parent  cast  to           if   to instanceof Cat                 to- gt  preferedKindOfFish    this- gt  preferedKindOfFish                    return  to             public function getPreferedKindOfFish                 return  this- gt  preferedKindOfFish           class Dog extends Animal       private   preferedKindOfCat   null       public function   construct  name   null   preferedKindOfCat   null                parent    construct  name            this- gt  preferedKindOfCat    preferedKindOfCat                        casts object         param Animal  to         return Animal             public function cast  to                parent  cast  to           if   to instanceof Dog                 to- gt  preferedKindOfCat    this- gt  preferedKindOfCat                    return  to             public function getPreferedKindOfCat                 return  this- gt  preferedKindOfCat            dogs   array      new Dog  snoopy    vegetarian        new Dog  coyote    any        foreach   dogs as  dog         cat    dog- gt cast new Cat         echo get class  cat      -      cat- gt getName       n

User · Answer

You can opt for this example below  Hope it will help       var ClassName  object      object- gt whateverMethod      any method defined in the class can be accessed by  object  I know this is not a cast but it can be useful sometimes

User · Answer

Without using inheritance  as mentioned by author   it seems like you are looking for a  solution that can transform one class to another with preassumption of the developer knows and understand the similarity of 2 classes   There s no existing solution for transforming between objects  What you can try out are    get object vars     convert object to array Cast to Object  convert array to object

User · Answer

I think that the best approach is to just create a new instance of a class and than assign the object  Here s what I would do   public function   someVO           someCastVO   new SomeVO          someCastVO    someVO        someCastVO- gt SomePropertyInVO    123        Doing this will give you code hinting in most IDEs and help ensure you are using the correct properties

User · Answer

PHP provides a very simple way of doing this by using   object    id   gt 1  name   gt  cat     https   www php net manual en language types object php  In your case you try this   dog   json encode  dog     cat    object  json decode  dog   More optimize method is   dog    array  dog   dog  newfield      xyz    dog    object  dog

User · Answer

class It       public  a            public function   construct  a             this- gt a    a            public function printIt                          contains static function to  convert  instance of parent It to sub-class instance of Thing  class Thing extends it       public  b            public function   construct  a   b             this- gt a    a           this- gt b    b            public function printThing             echo  this- gt a    this- gt b                  static function housed by target class since trying to create an instance of Thing     static function thingFromIt It  it   b            return new Thing  it- gt a   b               create an instance of It  it   new It  1       create an instance of Thing   thing   Thing  thingFromIt  it   2      echo  Class for  it      get class  it   echo  Class for  thing      get class  thing     Returns   Class for  it  It Class for  thing  Thing

User · Answer

It sounds like what you really want to do is implement an interface   Your interface will specify the methods that the object can handle and when you pass an object that implements the interface to a method that wants an object that supports the interface  you just type the argument with the name of the interface

[php] How to Cast Objects in PHP

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