How do I fill an object in PHP from an Array

Question

Suppose I have:

class A{
 public $one;
 public $two;
}

and an array with values:

array('one' => 234, 'two' => 2)

is there a way to have an instance of A filled with the right values from the array automatically?

Define automatically. Does the instance of A already exists or must it be created? If yes, with or without calling the constructor of that instance? — hakre
– hakre, Commented Mar 6, 2012 at 15:39
Duplicate of [PHP: How to turn an array into a StdClass object]? stackoverflow.com/questions/1885160/… — Red Taz
– Red Taz, Commented Mar 6, 2012 at 15:42
Sorry, I assumed StdClass was similar to Java's Object, it's not. — Red Taz
– Red Taz, Commented Mar 6, 2012 at 15:53

hakre · Accepted Answer · 2012-03-06 15:45:12Z

17

You need to write yourself a function for that. PHP has get_object_vars^Docs but no set counterpart:

function set_object_vars($object, array $vars) {
    $has = get_object_vars($object);
    foreach ($has as $name => $oldValue) {
        $object->$name = isset($vars[$name]) ? $vars[$name] : NULL;
    }
}

Usage:

$a = new A();
$vars = array('one' => 234, 'two' => 2);
set_object_vars($a, $vars);

answered Mar 6, 2012 at 15:45

hakre

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2 Comments

James Cazzetta Over a year ago

Brilliant! What would I need to change to get the same effect for another 2 dimension steps? $object['x']['y']['z'];

BeNice Over a year ago

NB This DOES NOT REVEAL PROTECTED and PRIVATE variables if used as a normal function. As 95% of all variables I use are protected for obvious reasons this does not work. (Wasted 20 mins on this.) Tried putting it in the class but then lots of array_key_exists needs 2 param warnings and no result so gave up. Might be usable with @menacingly suggestion but too clever for me so off to fudge it.

menacingly · Accepted Answer · 2012-03-06 15:37:07Z

2

If you want to allow for bulk-setting of attributes, you can also store them as a property. It allows you to encapsulate within the class a little better.

class A{
  protected $attributes = array();
  function setAttributes($attributes){
    $this->attributes = $attributes;
  }

  public function __get($key){
    return $this->attributes[$key];
  }

}

answered Mar 6, 2012 at 15:37

menacingly

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Comments

hakre · Accepted Answer · 2021-10-01 19:39:34Z

2

@hakre version is quite good, but dangerous (suppose an id or password is in thoses props).

I would change the default behavior to that:

function set_object_vars($object, array $vars) {
    $has = get_object_vars($object);
    foreach ($has as $name => $oldValue) {        
        array_key_exists($name, $vars) ?  $object->$name =$vars[$name] : NULL;
    }
}

here, the previous properties that are not in the $vars array are not affected.
and if you want to set a prop to null on purpose, you can.

edited Oct 1, 2021 at 19:39

hakre

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answered Oct 31, 2015 at 11:58

Nadir

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3 Comments

Dado Over a year ago

array_key_exists() function has two params - key & search.

Nadir Over a year ago

yes, right, I suppose I wrote it on the fly without testing. It then shall be: array_key_exists($name, $vars)

Simple Fellow Over a year ago

only works if object is initialize with defaults. with no constructor or default values it just slips thru

Naftali · Accepted Answer · 2012-03-06 15:32:34Z

-3

Yes there is.

You could use a pass thru method.

For example:

class A {
    public $one, $tow;
    function __construct($values) {
        $this->one = $values['one'] ?: null;
        $this->two = $values['two'] ?: null;
    }
}

$a = new A(array('one' => 234, 'two' => 2));

answered Mar 6, 2012 at 15:32

Naftali

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1 Comment

Naftali Over a year ago

@Rob2211 true, but it is the best that I can think of.

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