PHP: Trim every element in an object and if empty, set to N/A

Question

I have an object:

stdClass Object
(
    [Color] => Red
    [Shape] => Round
    [Taste] => Sweet
)

I want to trim each of the elements in the object and if that element is empty, set it to 'N/A'

So this object:

stdClass Object
(
    [Color] => Red
    [Shape] => 
    [Taste] => Sweet
)

Would become this:

stdClass Object
(
    [Color] => Red
    [Shape] => N/A
    [Taste] => Sweet
)

How should I accomplish this, array_walk maybe?

Answer 1

Let's keep it simple:

$foo = new StdClass;
$foo->prop1 = '   foo   ';
$foo->prop2 = NULL;
$foo->prop3 = 'bar';

foreach($foo as &$prop) {
    $prop = trim($prop);
    if (empty($prop)) {
        $prop = 'N/A';
    }
}

print_r($foo);

And that would give:

stdClass Object
(
    [prop1] => foo
    [prop2] => N/A
    [prop3] => bar
)

Answer 2

Here is a more sophisticated (and slower) one that would allow you to iterate over all properties of an object, regardless of Visibility. This requires PHP5.3:

function object_walk($object, $callback) {

    $reflector = new ReflectionObject($object);
    foreach($reflector->getProperties() as $prop) {
        $prop->setAccessible(TRUE);
        $prop->setValue($object, call_user_func_array(
            $callback, array($prop->getValue($object))));
    }
    return $object;
}

But there is no need to use this if all your object properties are public.