PHP: Set object properties inside a foreach loop

Question

Is it possible to set property values of an object using a foreach loop?

I mean something equivalent to:

foreach($array as $key=>$value) {
    $array[$key] = get_new_value();
}

EDIT: My example code did nothing, as @YonatanNir and @gandra404 pointed out, so I changed it a little bit so it reflects what I meant

but you did nothing there.. you took the same keys and values and just assigned it to the same place there were before that... — CodeMonkey
– CodeMonkey, Commented Jul 30, 2015 at 12:04
When you use foreach it must be an array to loop through. Rather generate the array the convert it to object. — Sougata Bose
– Sougata Bose, Commented Jul 30, 2015 at 12:06
you mean doing $this->$key = $value maybe ? where $key is the name of the property you want to check ? — Random
– Random, Commented Jul 30, 2015 at 12:06
Are you looking for something like foreach (get_object_vars($obj) as $key => $value) { ... }? — Phylogenesis
– Phylogenesis, Commented Jul 30, 2015 at 12:07

Joundill · Accepted Answer · 2020-08-17 21:13:03Z

6

You can loop on an array containing properties names and values to set.

For instance, an object which has properties "$var1", "$var2", and "$var3", you can set them this way :

$propertiesToSet = array("var1" => "test value 1", 
                         "var2" => "test value 2", 
                         "var3" => "test value 3");
$myObject = new MyClass();
foreach($propertiesToSet as $property => $value) {
    // same as $myObject->var1 = "test value 1";
    $myObject->$property = $value;
}

edited Aug 17, 2020 at 21:13

Joundill

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answered Jul 30, 2015 at 12:50

Random

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Comments

Steve Lockwood · Accepted Answer · 2015-07-30 12:54:20Z

2

Would this example help at all?

$object = new stdClass;
$object->prop1 = 1;
$object->prop2 = 2;
foreach ($object as $prop=>$value) {
    $object->$prop = $object->$prop +1;
}
print_r($object);

This should output:

stdClass Object
(
    [prop1] => 2
    [prop2] => 3
)

Also, you can do

$object = new stdClass;
$object->prop1 = 1;
$object->prop2 = 2;
foreach ($object as $prop=>&$value) {
    $value = $value + 1;
}
print_r($object);

edited Jul 30, 2015 at 12:54

answered Jul 30, 2015 at 12:48

Steve Lockwood

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1 Comment

mickmackusa Mar 10 at 5:20

By default, objects are modifiable by reference. There is no need to prepend & before $value. You could just write ++$value; in the loop body and be done.

bbankowski · Accepted Answer · 2015-07-30 12:36:18Z

0

You can implement Iterator interface and loop through the array of objects:

foreach ($objects as $object) {
    $object->your_property = get_new_value();
}

answered Jul 30, 2015 at 12:36

bbankowski

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Comments

JamesH · Accepted Answer · 2021-07-15 22:19:37Z

0

Hacked away at this for a few hours and this is what i finally used. Note the parameters passed by reference in two places. One when you enter the method and the other in the foreach loop.

private function encryptIdsFromData(&$data){
    if($data == null)
        return;

    foreach($data as &$item){

        if(isset($item["id"]))
            $item["id"] = $this->encrypt($item["id"]);

        if(is_array($item))
            $this->encryptIdsFromData($item);
            
    }
}

answered Jul 15, 2021 at 22:19

JamesH

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Comments

DenisVS · Accepted Answer · 2024-11-15 21:28:10Z

0

I suggest the function for set all properties of object by properties from another object.

//from object "from" all values will be set into object $to
function setAllProperties(object $from, object $to)
{
  $map = (array) ($from);
  foreach ($map as $key => $value) {
    $position = mb_strrpos($key,  "\x00");
    $propertyName = substr($key, $position + 1);
    $setter = "set" . ucwords($propertyName);
    $to->$setter($value);
  }
  return $to;
}

We can call this function from the same namespace:

$object1= $this->setAllProperties($object2, $object1);

answered Nov 15, 2024 at 21:28

DenisVS

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