PHP object like array

问题:

I need to be able to set my object like this:

$obj->foo = 'bar';

then after that is set i need the following to be true

if($obj['foo'] == 'bar'){
  //more code here
}

回答1:

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Try extending ArrayObject

You'll also need to implement a __get Magic Method as Valentin Golev mentioned.

Your class will need to looks something like this:

Class myClass extends ArrayObject {
    // class property definitions...
    public function __construct()
    {
        //Do Stuff
    }

    public function __get($n) { return $this[$n]; }

    // Other methods
}

回答2:

Just add implements ArrayAccess to your class and add the required methods:

• public function offsetExists($offset)
• public function offsetGet($offset)
• public function offsetSet($offset, $value)
• public function offsetUnset($offset)

See http://php.net/manual/en/class.arrayaccess.php

回答3:

ArrayObject implements the ArrayAccess interface (and some more). Using the ARRAY_AS_PROPS flag it provides the functionality you're looking for.

$obj = new ArrayObject(array(), ArrayObject::ARRAY_AS_PROPS);
$obj->foo = 'bar';
echo $obj['foo'];

Alternatively you can implement the ArrayAccess interface in one of your own classes:

class Foo implements ArrayAccess {
  public function offsetExists($offset) {
    return isset($this->$offset);
  }

  public function offsetGet($offset) {
    return $this->$offset;
  }

  public function offsetSet($offset , $value) {
    $this->$offset = $value;
  }

  public function offsetUnset($offset) {
    unset($this->$offset);
  }
}

$obj = new Foo;
$obj->foo = 'bar';
echo $obj['foo'];

回答4:

You'll have to implement the ArrayAccess interface to be able to do that -- which only means implementing a few (4 to be exact) simple methods :

• ArrayAccess::offsetExists : Whether or not an offset exists.
• ArrayAccess::offsetGet : Returns the value at specified offset.
• ArrayAccess::offsetSet : Assigns a value to the specified offset.
• and ArrayAccess::offsetUnset : Unsets an offset.

There is a full example on the manual's page I pointed to ;-)

回答5:

You're mixing objects and arrays. You can create and access an object like so:

$obj = new stdClass;
$obj->foo = 'bar';

if($obj->foo == 'bar'){
// true
}

and an array like so:

$obj = new Array();
$obj['foo'] = 'bar';

if($obj['foo'] == 'bar'){
// true
}

You can define a class and add implements ArrayAccess if you want to access your class as both an array and a class.

http://www.php.net/manual/en/language.oop5.php

回答6:

You can access PHP object as PHP array, but in different ways. Try this:

$obj->{'foo'}

That is similar with accessing array like this:

$arr['foo']

You can also do this:

$propertyName = 'foo';
$obj->$propertyName; // same like first example

回答7:

Your object must implement the ArrayAccess interface, then PHP will allow you to use the square brackets like that.

回答8:

You could also cast the object as an array:

if((array)$obj['foo'] == 'bar'){
  //more code here
}

回答9:

Enhance Class capability with no functionality drawbacks

You can also use ArrayAccess to access a single array property in your class and leave other properties being accessed in OOP way. Yet still it will work as you requested.

class Foo implements \ArrayAccess
{

/**
* mixed[] now you can access this array using your object 
* like a normal array Foo['something'] = 'blablabla'; echo  Foo['something']; ... and so on
* other properties will remain accessed as normal: $Foo->getName();
*/
private myArrayOptions = [];

private $name = 'lala';

    ...

    public function offsetExists($offset)
    {
        return isset($this->myArrayOptions[$offset]);
    }

    public function offsetGet($offset)
    {
        if ($this->offsetExists($offset)) {
            return $this->myArrayOptions[$offset];
        }

        return null; // or throw the exception;
    }

    public function offsetSet($offset, $value)
    {
        $this->myArrayOptions[$offset] = $value;
    }

    public function offsetUnset($offset)
    {
        unset($this->myArrayOptions[$offset]);
    }

    public function getName()
    {
        return $this->name;
    }

    public function __set($offset, $value){
        $this->myArrayOptions[$offset] = $value;
    }

    ...

}

The above will work as you expected.

$obj->foo = 'bar';
if($obj['foo'] == 'bar'){
    echo "WoWo";
}

Also note that Foo['name'] !== Foo->getName() those a two different variables