Convert cast an stdClass object to another class

Question

I m using a third party storage system that only returns me stdClass objects no matter what I feed in for some obscure reason  So I m curious to know if there is a way to cast convert an stdClass object into a full fledged object of a given type    For instance something along the lines of      stdClass is an stdClass instance  converted    BusinessClass   stdClass    I am just casting the stdClass into an array and feed it to the BusinessClass constructor  but maybe there is a way to restore the initial class that I am not aware of   Note  I am not interested in  Change your storage system  type of answers since it is not the point of interest  Please consider it more an academic question on the language capacities   Cheers

User · Accepted Answer

See the manual on Type Juggling on possible casts.

The casts allowed are:

(int), (integer) - cast to integer
(bool), (boolean) - cast to boolean
(float), (double), (real) - cast to float
(string) - cast to string
(array) - cast to array
(object) - cast to object
(unset) - cast to NULL (PHP 5)

You would have to write a Mapper that does the casting from stdClass to another concrete class. Shouldn't be too hard to do.

Or, if you are in a hackish mood, you could adapt the following code:

function arrayToObject(array $array, $className) {
    return unserialize(sprintf(
        'O:%d:"%s"%s',
        strlen($className),
        $className,
        strstr(serialize($array), ':')
    ));
}

which pseudocasts an array to an object of a certain class. This works by first serializing the array and then changing the serialized data so that it represents a certain class. The result is unserialized to an instance of this class then. But like I said, it's hackish, so expect side-effects.

For object to object, the code would be

function objectToObject($instance, $className) {
    return unserialize(sprintf(
        'O:%d:"%s"%s',
        strlen($className),
        $className,
        strstr(strstr(serialize($instance), '"'), ':')
    ));
}

User · Answer

And yet another approach using the decorator pattern and PHPs magic getter  amp  setters      A simple StdClass object      stdclass   new StdClass     stdclass- gt foo    bar       Decorator base class to inherit from class Decorator        protected  object   NULL       public function   construct  object                this- gt object    object               public function   get  property name                return  this- gt object- gt  property name                public function   set  property name   value                 this- gt object- gt  property name    value              class MyClass extends Decorator      myclass   new MyClass  stdclass      Use the decorated object in any type-hinted function method function test MyClass  object        echo  object- gt foo     lt br gt         object- gt foo    baz       echo  object- gt foo        test  myclass

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

consider adding a new method to BusinessClass   public static function fromStdClass  stdClass  in   BusinessClass      out                     new self       reflection object       new  ReflectionObject  in      reflection properties    reflection object- gt getProperties      foreach   reflection properties as  reflection property           name    reflection property- gt getName        if  property exists  BusinessClass    name                out- gt   name     in- gt  name              return  out      then you can make a new BusinessClass from  stdClass    converted   BusinessClass  fromStdClass  stdClass

User · Answer

Hope that somebody find this useful     new instance of stdClass Object  item    object  array       id        gt  1       value     gt   test object          cast the stdClass Object to another type by passing    the value through constructor  casted   new ModelFoo  item       OR       cast the stdObject using the method  casted   new ModelFoo   casted- gt cast  item     class Castable       public function   construct  object   null                 this- gt cast  object              public function cast  object                if  is array  object     is object  object                 foreach   object as  key   gt   value                     this- gt  key    value                                     class ModelFoo extends Castable       public  id      public  value

User · Answer

Yet another approach   The following is now possible thanks to the recent PHP 7 version    theStdClass    object       a    gt   Alpha      b    gt   Bravo      c    gt   Charlie      d    gt   Delta        foo   new class  theStdClass       public function   construct  data        if   is array  data            data    array   data             foreach   data as  prop   gt   value           this- gt   prop     value              public function word4Letter  letter        return  this- gt   letter           print  foo- gt word4Letter  a     PHP EOL     Alpha print  foo- gt word4Letter  b     PHP EOL     Bravo print  foo- gt word4Letter  c     PHP EOL     Charlie print  foo- gt word4Letter  d     PHP EOL     Delta print  foo- gt word4Letter  e     PHP EOL     PHP Notice   Undefined property    In this example   foo is being initialized as an anonymous class that takes one array or stdClass as only parameter for the constructor   Eventually  we loop through the each items contained in the passed object and dynamically assign then to an object s property   To make this approch event more generic  you can write an interface or a Trait that you will implement in any class where you want to be able to cast an stdClass

User · Answer

I have a very similar problem  Simplified reflection solution worked just fine for me   public static function cast  destination   stdClass  source         sourceReflection   new  ReflectionObject  source        sourceProperties    sourceReflection- gt getProperties        foreach   sourceProperties as  sourceProperty             name    sourceProperty- gt getName             destination- gt   name     source- gt  name            return  destination

User · Answer

Changed function for deep casting  using recursion          Translates type     param  destination Object destination     param stdClass  source Source     private static function Cast  amp  destination  stdClass  source         sourceReflection   new  ReflectionObject  source        sourceProperties    sourceReflection- gt getProperties        foreach   sourceProperties as  sourceProperty             name    sourceProperty- gt getName            if  gettype  destination- gt   name       object                 self  Cast  destination- gt   name    source- gt  name             else                destination- gt   name     source- gt  name

User · Answer

To move all existing properties of a stdClass to a new object of a specified class name          recast stdClass object to an object with type        param string  className     param stdClass  object     throws InvalidArgumentException     return mixed new  typed object     function recast  className  stdClass  amp  object        if   class exists  className           throw new InvalidArgumentException sprintf  Inexistant class  s     className          new   new  className         foreach  object as  property   gt   amp  value                 new- gt  property    amp  value          unset  object- gt  property             unset  value        object    unset   object      return  new      Usage    array   array  h   n      obj new stdClass   obj- gt action  auth    obj- gt params   amp  array   obj- gt authKey md5  i     class RestQuery      public  action      public  params array        public  authKey         restQuery   recast  RestQuery    obj    var dump  restQuery   obj     Output   object RestQuery  2  3        action    gt    string 4   auth      params    gt     amp array 2         0   gt      string 1   h       1   gt      string 1   n          authKey    gt    string 32   865c0c0b4ab0e063e5caa3387c1a8741    NULL   This is limited because of the new operator as it is unknown which parameters it would need  For your case probably fitting

User · Answer

BTW  Converting is highly important if you are serialized  mainly because the de-serialization breaks the type of objects and turns into stdclass  including DateTime objects   I updated the example of  Jadrovski  now it allows objects and arrays   example   stdobj new StdClass     stdobj- gt field 20   obj new SomeClass    fixCast  obj  stdobj     example array   stdobjArr array new StdClass   new StdClass      obj array      obj 0  new SomeClass       at least the first object should indicates the right class  fixCast  obj  stdobj     code   its recursive   However  i don t know if its recursive with arrays  May be its missing an extra is array  public static function fixCast  amp  destination  source        if  is array  source              getClass get class  destination 0             array array            foreach  source as  sourceItem                 obj   new  getClass                fixCast  obj  sourceItem                array    obj                     destination  array        else            sourceReflection   new  ReflectionObject  source            sourceProperties    sourceReflection- gt getProperties            foreach   sourceProperties as  sourceProperty                 name    sourceProperty- gt getName                if  is object   destination- gt   name                      fixCast  destination- gt   name    source- gt  name                 else                    destination- gt   name     source- gt  name

User · Answer

Convert it to an array  return the first element of that array  and set the return param to that class  Now you should get the autocomplete for that class as it will regconize it as that class instead of stdclass           return Order         public function test         db   new Database          order   array         result    db- gt getConnection  - gt query  select   from  order  where productId in  select id from product where name    RTX 2070           data    result- gt fetch object  Order      returns stdClass     array push  order   data         db- gt close        return  order 0

[php] Convert/cast an stdClass object to another class

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